Posts Tagged ‘Pellet Guns’

Hunting in South Africa: Part 1 by Jim Chapman

Wednesday, October 28th, 2009

Introduction
As an outdoor writer, and moreover one specializing in hunting airguns, I get to shoot a lot of airguns. There are many good rifles being produced today, and a few great ones. But what we have been missing is a great hunting airgun at a price point most hunters can afford. In a marketplace that is populated by guns starting at over a thousand dollars, not to mention the cost of adjunct gear such as filling equipment, it is difficult for new shooters to enter the sport. That is why I got excited when Crosman entered the precharged pneumatic arena, first with the Discovery then following with the Marauder.
The Discovery is a single shot PCP rifle that has everything the airgun hunter needs in an entry level gun; it is accurate, powerful, and reliable, fills to a low charge pressure with a handpump, and can run on CO2 for lower powered indoor shooting. But the truly compelling thing with this rifle is that packaged with a handpump it cost far less than anything else the airgun hunter could buy. I was lucky enough to be sent one of the first pre-production guns to shoot, hunt with, and give some feedback on. But truth is that I think the engineers and market research people got it just about perfect and delivered exactly what the market wanted and needed. However, there was room for a higher tier rifle that bridged the simple no frill design requirement of the Discovery and the more sophisticated (and much more expensive) rifles at the high end of the price/performance spectrum. While I really like the Discovery, I thought it would be perfect if there was an option to get it with a shrouded barrel, and if there was an option for a premium trigger to be installed by their custom shop (even if that cost a few hundred dollars more), and if there was a multi-shot version. That was the point; this gun hit so close to the mark that the only thing needed to make it a better gun were features only found on much more expensive rifles!

Then a couple years later I received word that Crosman had a new PCP rifle in development, and again was offered a pre-production gun for evaluation. The Marauder was unveiled at the 2009 SHOT Show in Orlando; and what was introduced to the airgunning world was a rifle offering features previously found only on much more expensive models. The Marauder has a 10 shot rotary magazine, a sophisticated match grade adjustable trigger that is a dream, and comes standard with a shrouded barrel that is whisper quiet. This in addition to the Marauder’s intrinsic accuracy and the power to take any small game from squirrels to woodchucks, has resulted in a gun I love to carry in the field. As a matter of fact, I selected the Marauder as my small game rifle for an airgun safari in South Africa’s Eastern Cape, which in past years has been a challenging testing ground requiring a gun to shoot with precision, hit hard, and be reliable. When you’re thousands of miles from home, it makes sense to only carry gear you believe in. The Marauder has proven itself to me.
My intention with these hunts was to demonstrate that the Marauder is the real deal for small and medium game hunting, and that they can be used to make one shot kills that cleanly anchor the tenacious small game and pest species in this hunter’s paradise. Even though this book was based on hunting in Africa, the experience speaks directly to the guns suitability for hunting anywhere in the world.

Hunts were setup over a five week period in South Africa, and I planned to make the most of the hunts. My friends and professional hunters Rob Dell and Andrew Myers were contacted to organize the trip. From my Indiana based office I was phoning sponsors; Crosman for guns, scopes, and pumps to be drop shipped for pick up on my arrival to the Eastern Cape, Pyramyd Airgun, arguably the biggest and one of best airgun supplier in North America came through with financial support, and Adventures in airguns supplied additional equipment. It all came together and formed one of the most enjoyable hunts of my life.
In this small booklet my objective is to share several facets of hunting with the Marauder, relating our experiences regarding the guns, the gear, the people, and the game. And in the end I believe you’ll see that if you own a Crosman Marauder, you have a gun that takes you anywhere you want to go.

Hunting with Airguns
There is a long tradition of hunting with pre-charged pneumatic (PCP) air guns, dating back to the late 1600s when big bore air rifles were used by European nobility to take large game animals. In more recent years, spring piston airguns became available to the masses, and after World War II there was a dramatic increase in the availability of guns. The sport has continued to grow in much of the world, especially in those locales where gun ownership is not an option for the civilian population. In Europe there is a tradition of high quality airgun manufacturing, especially in Germany and the United Kingdom.
As a matter of fact, the UK has arguably been the center of the modern airgunning world. They produce many of the finest spring piston and PCP airguns in the world; and support a vibrant airgun hunting community with a couple popular magazines dedicated to reporting on and promoting the sport. And while the range of available guns offered to the market comprises both spring piston and PCP power plants, there has been an upsurge in the popularity of precharged pneumatic guns in the market over the last decade.

In the United States serious airgun hunting has been relatively unknown, and even less so when it comes to PCPs. However, as Americans are faced with increased urbanization, the attraction of the air powered hunting arm becomes ever more apparent; providing a means of hunting in areas that are more densely populated where firearms are a no-go. While many hunters feel that PCPs are easier to shoot accurately and tend to be more powerful than spring piston guns, the fact that there has been a dearth of appropriately priced PCP guns for the American sportsman has blocked a lot of new hunters from entering the sport. With Crosman’s release of the Discovery and the Marauder, this is going to change in my opinion!

In this book I will examine how these new Crosman guns can be used for field work, and relate some firsthand experiences coming out of our five week airgunning trek in South Africa, in which I relied solely on the Marauder and the Discovery for small game hunting.

Why Hunt With Airguns?
As stated previously, in Europe and much of the world airguns are the only option available to people wishing to hunt. They simply are not allowed to possess firearms, or the population densities are so high that there is not enough open land to hunt over. But there are several reasons that shooters everywhere appreciate; airguns are relatively quiet (in the case of the Marauder, less than a whisper) and have a limited carrying range, they can therefore be used to perform pest control duties and hunt in fairly populated areas, and due to the limited range can even be shot safely in the backyard or down in the basement. The cost of airgun projectiles is much lower than even .22 rimfire ammunition, with pellets costing a penny or two per round. The challenge of the hunt is increased with airguns, because to ethically take game the hunter must close the distance which requires honed hunting skills. In this respect airgun hunting offers many parallels to bow hunting while incorporating traditional marksmanship.

The modern PCP airgun is capable of tack driving accuracy out to sixty or seventy yards, while most springers can be used with confidence out to thirty five or forty yards. Another benefit is that the hunter can get in a great deal of practice. I will often go down to my basement range and put a couple hundred rounds through a gun I’m getting ready to take with me into the field. You’re not going to be able to do this with a firearm unless you happen to live on a ranch in Montana.
The last reason on my list is the least tangible …. Airguns are cool! There is something about the engineering that goes into these guns, along with the diversity in designs available that makes airguns a highly addictive past time. The airgun uses a tiny puff of air to send a fifteen or so grain piece of lead down range to anchor their quarry! This is a fact that always amazes me…

by Jim Chapman

———————————————————————————————————————————

All right folks that is all for part one, we will be posting the rest of the book a few chapters at a time over the next few months. After that the full book will be available to download.

Thanks for reading.

Joshua

Marauder Single Shot Tray is available…

Thursday, October 15th, 2009

Since releasing the Marauder we have had one accessory request more than any other, a single shot tray. Well we heard you loud and clear. The new single shot tray slides in the same channel that the multi-shot clip fits in and allows for a single round to be fired from the Marauder. The single shot tray is available in the PCP Accessories section of the site. Here is a link…

PCP Accessories…

Keep your suggestions coming. We’re listening.

Joshua

Reporting on the Crosman Challenger PCP: Part 2

Friday, October 9th, 2009

PCP Challenger

I promised you I would check out the shot performance of the new Challenger right “out of the box”.

First, using the Benjamin hand pump, I charged the Challenger to 2000 psi - the factory recommended fill pressure. I used the gauge on the pump for all tests to maintain consistency.

Next, I chronographed the shots and noticed a close to 540 fps starting velocity with Crosman 7.9 grain Premiers. The factory claims a 530 fps velocity so it seems this one was set to shoot a hair hot.

I chose the 7.9 grain Premier pellet because it is what I will use later when I bring the power up to field target velocities. Beginning at 540 fps helped me decide where to stop, but I will take it further to see how the shot string looks.

My task was to chronograph each shot until the velocity came back to around 510 fps. I’m sharing the graphs with you so you know what to expect from an “out of the box” stock Challenger with a field pellet. Velocities are similar for a wadcutter match pellet.

Below is the complete shot string shooting from 2000 psi down to 1000 psi. This yielded a 50 fps spread with a 541 fps average velocity for 107 shots.

Shot String 1

The shot string indicates that a 2000 psi charge pressure brings you right into the sweet spot of the charge and not the beginning of it. My Challenger will require an adjustment (most likely slightly shortening the stroke), or a slightly higher charge pressure to find the start of the sweet spot which will yield more shots from the charge.

Keep in mind that most gauges are consistent but are not necessarily accurate. Although I charged the Challenger to 2000 psi on the hand pump’s gauge, it may have actually been 1900 psi and I might need to charge a little higher on that gauge.

I recommend that once you find the correct charge pressure for your particular gun, that you make a mark on the gauge of your gun. That way you will know where to fill it every time; whether with a pump, scuba tank or any fill assembly you choose to use. The gauge on your gun is the same no matter how you fill your gun. Incidentally, I charged the gun back up to 2000 psi with the Benjamin hand pump and it took 58 strokes. I also recommend that you mark your gun’s gauge so you know when to recharge it (once you decide the optimal spot). With your gauge marked in both places, any shot taken with the needle on the gauge between those 2 marks should be a good shot.

The next graph shows the shot string trimmed down to a 24 fps spread for 80 shots. Certainly enough for any 10 meter 3 position match.

Shot String 2

The following graph is for people like me looking for the tightest spread possible from their equipment. This string was trimmed down to a 19 fps spread and 70 shots. This would work very well for people that want to shoot longer distances at the factory stock velocity. Great for MiniSniping or even target class silhouette. For silhouette I would probably increase the velocity closer to 575 fps and live with the reduction in shot count. Those rams at 45 yards some times need a little more push to get them to topple. They will drop with the velocity from the Challenger as it is “out of the box”, but I like a little more just in case.

Shot String 3

The 70 shots yielded a total of 368.8 accumulated ft lbs.

When we power up the Challenger for 11 – 11.5 ft lbs of pressure, it should yield around 25 to 30 shots (368.8/11.5=32). We look forward to seeing how that will work out.

On another note, keep in mind that replacing any part of a Crosman gun, that did not come with the gun or was designed for that gun, voids the warranty. So when we go and power up the Challenger (even though we are using Crosman parts) we are voiding the warranty. Please be very clear in understanding that if you follow along with us and do the same things, you will be voiding your warranty. Just something important for you to think about….

I charged Hans’s Challenger to 2000 psi and fired through the chronograph. The first shots were a little low in velocity and quickly came up to the 530 fps velocity advertised by Crosman. Hans’s Challenger appears to prefer a 1950 to 1925 psi charge (on his gauge) at this time.

Hans mounted a scope to his Challenger and did some quick shot groups to see how it performed out of the box – with no preparations or adjustments at all. At 10 yards, his 5 shot group was 1 pellet hole. Not a one hole group mind you, but one pellet hole that would hit the 10 dot on a 10 meter target centered every time! At 25 yards in a little bit of a wind Hans grouped .25” ctc. At 40 yards Hans grouped .75” ctc. Remember this is benched, in an inconsistent wind at 530 fps with 7.9 premiers. Bringing the velocity up to WFTF levels will tighten those distant groups for sure. It’s very, very promising.

So there you have it. What you can expect from the Crosman Challenger right out of the box. If you are shooting to 10 meters, then you can get close to 100 shots once you find the best starting charge pressure for the gun’s sweet spot. If you plan on shooting longer distances you can get around 70 to 80 shots depending on your needs.

We are going to review scope setup for the Challenger down the road, so I have some homework for you….

Visit our website (http://ateam.100free.com/Articles.htm) and print the “A” Team Parallax adj document. You can use these directions to prepare your scope for the Challenger.

Also on our website (http://ateam.100free.com/Crosman.htm) is our A Team PCP Tuning Procedures document.

Download and save or print each of these documents and become familiar with them.

Ray and Hans ~ The “A” Team

Reporting on the Crosman Challenger PCP

Thursday, September 17th, 2009

Ray and Hans Apelles

Meet Ray and Hans Apelles – Crosman Pro Staff, and National and World Field Target Competitors

The father and son team of Hans and Ray Apelles “The ‘A’ Team” started shooting field target in 1995 after reading a magazine article about competitive field target matches. They attended a local match together, and the rest is history.

By 1998, they were competing at Nationals and placing in the top 5. In 2000 Ray attended and placed 5th in the Worlds/Nationals after a 3 way shoot off.

During 2007 Ray and Hans were invited to become members of the Crosman Pro Staff. As members, they are supplied prototype airguns to review, compete with, and comment on for us. While shooting a prototype of the Discovery PCP at the 2008 Nationals, Ray placed second in the International PCP competition, one point back from the leader.

Since many suggestions made by Ray and Hans have been successfully applied in our Benjamin Discovery and Marauder PCP’s, and since we greatly respect their expertise and opinion, we thought we would give them a shot at our new Challenger PCP CH2009 competition air rifle. This is what they told us….

Ray Reporting on the Crosman Challenger PCP CH2009

Hans and I just received our new Crosman Challenger 2009 PCP air rifle, and want to share our comments on the gun right out of the box.

Our intent is to turn the Challenger into a field target gun. Giving you a step-by-step description of what we change to bring the Challenger up to World Field Target Federation power levels, we will share what we replace or modify on the Challenger by giving you the part number (whenever possible) and exactly how we accomplish those modifications.

It is our hope that if you do exactly the same things we do, you will have your own reasonably priced world class field target rig. We will tell you what scope rings we use for which scope, and how it gets mounted with settings on the adjustable hammer stroke and spring tension. What the fill and recharge pressures are, and how many shots we get from a charge. You will have a chance to see a sample of our shot string, and once we sight it in together, we’ll even give you a hold over trajectory.

Let’s get started by taking a first look at the Challenger.

The Challenger is packed well in a plain brown box with no graphics. Included in the box are a user’s manual, some Allen wrenches, and a degassing tool which would mostly be used for CO2 users. (We will not be using or testing the Challenger with CO2 but it is designed as a Duel Fuel PCP Airgun as the Discovery is.)

Holding the Challenger reminds us very much of our highly modified Discovery match prototypes. The stock is the same style we have been shooting for over a year now and are very comfortable with. The stock has an adjustable comb (cheek riser), and an adjustable pull length that can be varied by loosening two screws.

The butt pad can be adjusted in height through a sliding and rotating pad customary on 10 meter 3 position guns. We notice that the butt pad post can be rotated and adjusted to an angle that fits perfectly and will prevent any tendency to cant the gun as it is shouldered.

I have shot many guns that are a chore to hold perpendicular when shouldered because of the fit. A simple few degrees of rotation on the shoulder pad forces a correct upright position when the gun is shouldered.

The bottom of the stock has an accessory rail which can be used for a variety of after market accessories such as a palm rest, sling swivel quick release, forearm riser, bipod, and additional weight sets to name a few. Although Crosman doesn’t offer these particular accessories currently, it is nice to know they can be easily added to the stock if you procure them elsewhere.

On the right side of the stock is the built in manometer (pressure gauge). It is in very easy view so you don’t have to turn the gun upside down to see it. We did suggest to Crosman that it be placed on the left side of the stock so it would be in plain view of right handed shooters (the majority) but Crosman didn’t want something to possibly distract the shooter.

The stock is completely ambidextrous and will fit all shooters with a little bit of adjustment. With a very comfortable vertical pistol grip, it is an easy reach to the match trigger.

The advertised weight is 7.3 lbs. which stays within the 7.5 lbs. limit of the Civilian Marksmanship Program (CMP) Sporter Class specifications, which the Challenger has been approved for.

The Challenger action resembles a Discovery but only at a quick distant look. It uses the same reservoir size as a Discovery and same barrel diameter, and while you may notice similar barrel bands and filler cap, things change after that.

At the back of the action is a T handle cocking bolt. This is a very comfortable and ingenious mechanism. Pull straight back on the T handle (from either side as it is ambidextrous) and the bolt opens. Pull further back to cock the gun. Once cocked, drop into the pellet trough your chosen pellet and push the bolt straight in to close the bolt. Make sure to push the bolt all the way in and you’re ready to fire.

The trigger is the same one designed for the Marauder which has proven itself very well.

The Challenger comes set to meet the CMP trigger specifications. It can be adjusted as desired. (We will test the trigger later and report on just how it was set). Moving the manual safety to the front of the trigger guard turns the safety off and the trigger is ready to fire. Pulling the trigger reveals a long first stage and a very crisp second stage… and the shot is away.

Below the T bolt handle is a thumb screw that can be used to adjust the hammer spring tension. We would have preferred this to be an internal adjustment via an Allen wrench but it is enough out of the way to not be accidentally adjusted. Normally a gun is set to the shooter’s specifications and left alone (to maintain consistency) which is why we prefer to not have this adjustment readily available with no tools required for adjustment. Adjust the hammer stroke by inserting the appropriate sized Allen wrench through the center of the thumb screw. The degassing tool works the same way through the thumb screw.

The upper receiver is another departure from the Discovery as it is longer and allows the peep sites required for 3 position shooting. The loading port was moved forward to allow more room for the rear sight. This effectively gives us more room to mount a scope as well. The upper receiver also has a more professional look than the Discovery.

Moving forward of the upper receiver you find a Lothar Walther barrel. Accuracy won’t be an issue with this barrel. Lothar Walther barrels have become a standard that many strive to match and rarely exceed. Just a bit further down the barrel from the upper receiver you come to a barrel band which has been placed there to help hold down the receiver (as we did in our Discovery Match Prototypes). Further down the barrel you see another barrel band which is actually a barrel protector band. The barrel is free floated from the first barrel band forward. So if you bump the barrel and hear a “tink” you are reminded that the barrel is free floated and designed as such. Moving further forward is the front muzzle break which sports a dovetail for the front globe sight. The muzzle break is squared off to very attractively match the upper receiver.

So ends our “out of the box” review of the Crosman Challenger.

Hans and I performed some preliminary tests on our Challengers as soon as we took them out of their packages. I charged Hans’s Challenger to 2000 psi and fired through the chronograph. The first shots were a little low in velocity and quickly came up to the 530 fps velocity advertised by Crosman. Hans’s Challenger appears to prefer a 1950 psi charge at this time.

For our next segment, we’ll post our first shot strings of the Challenger, some of our initial accuracy tests and begin discussing those adjustments we mentioned. We will then take a journey to turn your Challenger into a cost effective “world class” field target gun.

Follow along and see where the journey leads…….

Oh yeah, we attend many matches and always invite fellow competitors and spectators to shoot our guns so they can see for themselves what can be done with airguns, and how easy it can be when the equipment is set up for their individual needs. We always invite people to shoot our new Crosman prototypes as well. While we enjoy the feedback, it also helps us to decide which direction to go with our next project.

Ray and Hans ~ The “A” Team

Discovery at Junior Shooters…

Tuesday, July 28th, 2009

The Marauder has been generating a lot of excitement since it’s release, and rightly so. But we can’t forget the Discovery, which has been a PCP phenomenon in it’s own right. The Discovery paved the way for the Marauder and is still out there making it’s mark and getting great reviews from shooters everywhere.

A prime example is this feature over at Junior Shooters. This is a great website focused on the competitive youth shooting communities. Click here to check out the Discovery feature…

Thanks for reading.

Joshua

More NPSS links…

Friday, July 10th, 2009

The NPSS is still making it’s round and the feedback has been really strong. Here are some more links to some of the blogs covering the gun around the net…

The Pyramyd Air Blog - Tom Gaylord completes his review with part 2 and 3…
Part 2
Part 3

Airguns of Arizona - Jock Elliott has also done a very nice look at the NPSS…
Part 1
Part 2

Benjamin Marauder: Your mileage may vary

Friday, June 5th, 2009

Crosman recently released our new Marauder PCP gun, and one of the features that make it different from its predecessor, the Discovery, is its adjustability. In fact it is probably the most adjustable PCP gun on the market. This also makes it one of the most versatile guns. Its adjustable hammer energy and valve transfer port allow the gun to operate at fill pressures between 2,000 and 3,000 psi, and at various velocities. Due to these inherent features we are often asked about making adjustments for various shooting purposes. Our own factory sponsored team of Ray and Hans Apelles have a very in depth adjustment procedure that is a must read. It can be found here:
A-Team Tuning Procedure

This July a number of Crosman employees will be participating in a Field Target shoot in Binghamton, New York NERFTC. As that date is rapidly approaching, I started to consider what equipment to bring. That naturally got me thinking about how best to set up our new Marauder for optimum performance for long distance shooting.

Let me first preface this by saying I should not be confused with an expert in any shooting discipline in general, and field target in particular (that is why we worked with Hans and Ray Apelles on this project). I am also not the Engineer that designed the Marauder (that’s Russ), or the Premier Pellet (that of course, was Bob Holtz). I am just lucky to have worked with them all. Furthermore, I am not claiming that these velocity profiles are the best that can be achieved or that if you dial your gun in at the same setting you will get the same results. Your mileage may vary. This is just my opinion and thought process as I got my gun ready to shoot this match. I do hope this helps to illustrate

Here are some adjustment options and how I document them:

  • What I am labeling “Hammer Tension” the manual calls “Hammer Spring Pre-load adjuster” and for shorthand, I label “H”. When I say ”6 H”, I mean that the hammer adjustment is six revolutions in (clockwise) from the minimum starting point of completely (counterclockwise) out.
  • “Stroke Adjustment” is what the manual calls “adjusting the striker” or “hammer stroke” and I am using “S” as my shorthand. So “2.5 S” is shorthand for when you have the stroke adjusted two and a half revolutions in (clockwise) from the maximum starting point of completely (counterclockwise) out.
  • The “Transfer Port Adjustment” is what the manual calls the “metering screw” and I am using “V” as short hand (for velocity or “venturi “). The starting point is all the way (clockwise) in.

Starting point:
First off you should always document your starting point as a base line. If for no other reason than to make sure you can get back to the factory settings. The Marauder (as shipped in .177 cal.) has a velocity profile that starts at 2500 PSI and ends around 2000 PSI, and when shooting 10.5 grain Premiers, will usually average around 853 over 30 shots. We felt this was the best compromise for shooters that could be using a hand pump or a scuba tank to fill the gun. The velocity was also reasonably high enough for longer distances, while still getting a shot count of 30. The gun has a 10 shot magazine, and I like to think in multiples of 10 for shot count when looking at possible combinations.

Marauder Tuning Chart

Caliber - 177
Grains - 10.5
Hammer Tension (H) - 3
Stroke Adjustment (S) - 2.0
PSI Fill- 2500
PSI End - 2000
Pumps to Recharge - 44
Transfer Port Adjustment (V) - 2
Minimum Velocity- 837
Maximum Velocity- 862
Average Velocity - 853
Median Velocity - 855
Standard Deviation - 7.20
Extreme Spread - 25
Average FTLBS - 17.0
Cumulative FTLBs - 509.1
# Shots - 30
# of pumps per shot - 1.5
Foot pounds per pump (FtripleP) - 11.6

Faster is better
First I wanted to see the highest velocity I could achieve so as to get the flattest trajectory. I used the 10.5 grain Crosman premier heavy (CPH), as I have had the best results with them in this gun.

Marauder Chart

Caliber - .177
Grains - 10.5
Hammer Tension (H) - 6
Stroke Adjustment (S) - 0.0
PSI Fill - 3000
PSI End - 2200
Pumps to Recharge - 65
Transfer Port Adjustment (V) - 4
Minimum Velocity - 1007
Maximum Velocity - 1039
Average Velocity - 1025
Median Velocity - 1025
Standard Deviation - 9.32
Extreme Spread - 32
Average FTLBS - 24.5
Cumulative FTLBs - 490.0

# Shots - 20
# of pumps per shot - 3.3
# Foot pounds per pump (FtripleP) - 7.5

As you can see in order to get up to 25 foot pounds of energy (FPE), I needed to open the Transfer Port (V) out to max of four turns ( V 4). I also started at 3000 psi and had the longest stroke adjustment (S 0). The numbers I look at for longer range shooting try and keep the velocity spread under 30, the standard deviation under 9, and ideally below 5. I was a little high, but it was as close as I could get with this gun while keeping the other requirements.
Summary: This adjustment would give me plenty of power in case of a windy day, and also the least amount of drop at the 55 yard line. The down side is that the accuracy at this velocity may not be the best that it can be, Bob Holtz used 800 fps to do all his accuracy testing when he developed the Premier pellet. On a more a practical standpoint, I don’t want to have to count on having 3000 psi to fill the gun. If I was hand pumping, it would be too much like work. Most important was that most clubs limit you to around 20 FPE to reduce target damage, so I had to rethink my requirements.

Accuracy is king
My next idea was that if 800 fps was the most accurate velocity, I could probably get 40 good shots and keep in just under 12 FPE needed to shoot with the big boys in International Class.
I also wanted to bring the fill pressure down so that I wouldn’t have to pump as hard. To go under 12 foot pounds I would also change pellets to the Crosman Premier Lites (CPL).

Marauder Tuning Chart

Caliber- 177
Grains- 7.9
Hammer Tension (H)- 4.5
Stroke Adjustment (S)- 6.8
PSI Fill- 2150
PSI End- 1800
Pumps to Recharge - 28
Transfer Port Adjustment (V) - 1.5
Minimum Velocity - 797
Maximum Velocity - 824
Average Velocity - 813
Median Velocity - 814
Standard Deviation - 6.98
Extreme Spread - 27
Average FTLBs - 11.6
Cumulative FTLBs - 463.9

# Shots - 40
# of pumps per shot - 0.7
Foot pounds per pump (FtripleP) - 16.6

So to get the power level down, I turned the metering screw way down to 1.5 V, and backed off on the hammer energy by turning the Stroke in, to almost 7 S. The fill pressure of 2150 seems a little odd, but I just marked the gauge on the gun and filled to that mark.

Summary: I hit the velocity spread and standard deviation numbers that I wanted. I liked the number of shots per fill and it was easy to pump at this pressure. Reality was starting to set in when I considered how much Kentucky windage I was going to have to use. I was not really that good a shot when you consider that I was going to be shooting unsupported in the sitting position. I need all the advantages I can get if I’m not going to use shooting sticks like I did in Hunter class.

Compromise
The one thing I liked the most was the lower fill pressure so I decided what I wanted was exactly a 2000 psi fill for a starting point. That way I could use one of our 72 cc bottles (add link) and not have to worry about overfilling. Also, I wanted to go back to using the CPH and be at around the factory setting of 850 fps with at least 30 shots.

Marauder Tuning Chart

Caliber - 177
Grains - 10.5
Hammer Tension (H) - 2.25
Stroke Adjustment (S) - 4.3
PSI Fill - 2000
PSI End - 1655
Pumps to Recharge - 33
Transfer Port Adjustment (V) - 2.125
Minimum Velocity - 840
Maximum Velocity - 857
Average Velocity - 850
Median Velocity - 851
Standard Deviation - 4.76
Extreme Spread - 17
Average FTLBS - 16.8
Cumulative FTLBs - 337.0

# Shots - 20
# of pumps per shot - 1.7
Foot pounds per pump (FtripleP) - 10.2

I did this by opening up the transfer port adjustment to a 1.75 V and with a few hammer adjustments I was in the ball park.

Summary: Close, but not there yet. Unfortunately there was too much velocity variation. I would have to give up some of the shot count.

Fine tuning
Normally when I am trying to get a flatter velocity profile, I decrease transfer port diameter by turning the metering screw (V) in. On this gun it worked out to be the opposite. This just shows that sometimes it is best to make small adjustments and have patience (and a lot of pellets). With a little bit of trial and error, this is what I finally settled on.

Marauder Tuning Chart

Caliber - 177
Grains- 10.5
Hammer Tension (H) - 2.25
Stroke Adjustment (S) - 4.3
PSI Fill - 2000
PSI End - 1655
Pumps to Recharge - 33
Transfer Port Adjustment (V) - 2.125
Minimum Velocity - 840
Maximum Velocity - 857
Average Velocity - 850
Median Velocity - 851
Standard Deviation - 4.76
Extreme Spread - 17
Average FTLBS - 16.8
Cumulative FTLBs - 337.0

# Shots - 20
# of pumps per shot - 1.7
# Foot pounds per pump (FtripleP) - 10.2

If you look back up at the factory settings, you will see that they are not that different. I had come full circle. All I really needed to do was reduce the Stoke to 6.25 S and that would have reduced the hammer energy enough to bring my fill pressure down. This is a good place to point out that if you are having trouble getting the results you want, try increasing (or decreasing) your fill pressure to find the range that works best for you.

Summary: I found the velocity that I wanted and most importantly it was consistent. As I am going to be using the small bottle, it won’t be that much of problem to fill after only 20 shots, and with a 350 psi band of air I am able to get a dozen gun fills from one bottle fill (240 shots). Give it a try and let us know what you think.

Second option

I was happy with the results with the last test, but I decided that I should also see how the gun would shoot at 20 FPE. At this point I was getting the hang of this process and I know that since I had the hammer tuned for the current fill pressure all I should have to do in open up the V adjustment. I set the fill pressure around 1900 psi and adjusted the V screw out until I had a little over 900 fps.

Here is my Chart…

Marauder Tuning Chart

Caliber - 177
Grains - 10.5
Hammer Tension (H) - 2.25
Stroke Adjustment (S) - 4.3
PSI Fill - 2000
PSI End - 1655
Pumps to Recharge - 33
Transfer Port Adjustment (V) - 3
Minimum Velocity - 901
Maximum Velocity - 923
Average Velocity - 913
Median Velocity - 915
Standard Deviation - 7.10
Extreme Spread - 22
Average FTLBS - 19.4
Cumulative FTLBs - 388.8
# Shots - 20
# of pumps per shot - 1.7
#Foot pounds per pump (FtripleP) - 11.8

Summary: The velocity is not as flat as the last one, but acceptable and I have the added advantage of a little more power. Next step is to set up a scope and get out to the range and see what setting shoots best.

Give it a try and let us know what you think.

Ed

Warning: Please read your owner’s manual for safe operation of the Marauder, as well as the instructions for making these adjustments. In order to properly make these adjustments, a certain level of familiarly with the fundamentals of a Pre-Charged Pneumatics (PCP) gun is assumed. If you are not comfortable with the procedures talked about here and in the manual, please seek the assistance of a professional Air Gun Smith.

2009 Northeast Regional Field Target Championship

Wednesday, May 20th, 2009

Field Target Shooter

Summer is here and it isn’t just the weather that’s heating up, so is the shooting! One of the fastest growing competitive shooting events is Field Target Shooting. Competitions are popping up like dandelions in communities all across the country.

Field Target Shooting is a hunting simulation game where shooters fire at steel silhouettes shaped like animals placed at various distances. The shooters are either stationed behind a firing line or walking through a course where targets are placed in trees and bushes to make the shooting more authentic.

Field Target Shooting has become a favorite of many of us here at Crosman which is why we are teaming up with the Broome County Sportsmen’s Association to sponsor the 2009 Northeast Regional Field Target Championship in Binghamton NY this July 11.

We’ll be on hand to show off some of our newest airguns including the PCP Marauder, Challenger, and the NPSS Nitro Piston Break Barrel. We will also be knee deep in the shooting action with several members of the Crosman staff taking part in the competition.

Come out and join us for a day on the course. For more information, and to register for the competition, check out the official site at….

http://www.bcsportsmen.org/ft/NERFTC.html

We’ll see you there!

Thanks for reading,

Joshua

Benjamin Marauder - part 3 by Tom Gaylord

Monday, April 20th, 2009

In this report I’ll show you the accuracy and velocity I achieved with my test Marauder. Remember, I have a .177.

Crosman asked me what velocity I would like with which pellet before they sent the test rifle. So I was fortnate to have the rifle arrive set-up the way I wanted it. I asked for a gun that would shoot the 10.5-grain Crosman Premier at about 900 f.p.s.–give or take. Anywhere between 875 and 920 would have been okay with me.

When I competed in field target several years ago I shot a Daystate Harrier, using a 10.5-grain Premier at 915 f.p.s. And I did very well with that combination. Now, the .177 Marauder is advertised to get up to 1100 f.p.s. in .177 and 900 f.p.s. in .22, but if you are reading this blog you are probably savvy enough to know that speeds above 1,000 f.p.s. are not where the best accuracy lies. Field target competitors usually keep their guns shooting around 900 f.p.s., and of course all FT rifles are in .177 caliber.

I also asked for the test gun to be set up for a 3,000 psi fill level, but it turned out that the gauge at Crosman and my own fill gauge disagree by 500 psi. I proved that with my chronograph that showed when I filled it to 3,000 it took many shots for the velocity to climb into the useful range. But by stopping at 2,500 psi, the gun was on the power curve with the first shot.

I get 25 good shots from one fill. They range from a low of 912 f.p.s. to a high of 940 f.p.s. That’s a spread of 38 f.p.s. The average is 925 f.p.s. Of course all of this information is meaningless without accuracy data to confirm that it has value, so I went to the range straightaway.

I sighted the rifle in at 10 feet and once I knew where it was shooting (took two shots) I went straight out to 50 yards. Another five pellets got me zeroed. The first group after that measured 0.674″ for five 10.5-grain Premiers. The very next group was the best one shot thus far. It measures 0.443″ center-to-center, for five shots.

Groups of Shots...

The first group after sighting-in at 50 yards (left) measures 0.674″. That’s five 10.5 Premiers! The group on the right was the very next group fired and measures 0.443″ It was the best of the series.

I continued shooting and the groups ket on coming. Nothing was as large as seven-tenths of an inch. This is very good accuracy for 50 yards. You can often get a few groups this good and maybe a little better, but there will be others the measure three-quarters of an inch. The Marauder just wants to shoot the tight ones!

I next tried other good pellets that in other rifles can sometimes be even better. Beeman Kodiaks are a wonderful .177 long-range pellet in many PCPs, but in my test Marauder they didn’t shoot nearly as well as heavy Premiers. The same for 10.3-grain JSB Exact domes. So Premier heavies are definitely the pellet of choice, so far.

After about a dozen more groups I ended the session. A few days later I was on a different range under wet and misty conditions. Once again the Marauder shined, giving 5-shot groups of less than seven-tenths of an inch.

Range

This day was cold and wet. Once again the Marauder performed very well at 50 yards. The groups were all under seven-tenths of an inch, and averaged about the same as on the first day.

Groups...

This group of five Premiers at 50 yards measures 0.526″.

Groups

The largest group shot during the second range session measures 0.662″. That’s pretty consistent shooting.

One interesting side note to the second range day was that all of my blued-steel firearms rusted while on the range. The Marauder no only didn’t rust, it didn’t even need to be wiped down after coming home. I just stood it in the corner until the next time!

In an interesting twist, Crosman sent me the parts to upgrade my test rifle to the production specification. I will be busy with my new television show for the next several weeks, but I will install and test those parts for you and report the results here. The rifles will go on sale before then, so others around the country will also chime in with their thoughts and opinions. But as of right now I believe Crosman has a big hit on their hands!

Benjamin Marauder: Part 2 by Tom Gaylord

Monday, April 13th, 2009

The Benjamin name is on the bottom of the forearm so everyone knows where the rifle is in the rack.

In Part One I stopped just before I got to the trigger, so let’s begin with that. Crosman says this trigger is an adjustable match-type unit, and I know that kind of terminology gets kicked around a lot these days. You can even find Chinese breakbarrels that will tell you they have a match-type trigger.

Tell me about the trigger
Well, in this case, it’s true. This trigger on this rifle is sublime. It’s the same unit they’re going to put in the new Challenger PCP target rifle, and when I tried that one on the sample rifle in their booth at the 2009 SHOT Show, they had it set to break at way less than a pound. So when the factory called me to set up my test Marauder, they asked me what kind of trigger pull I wanted. I told them a pound and a half, and I’m darned if they didn’t send along a computer printout that shows the trigger breaking at 1.636 lbs. My finger cannot tell the difference between that and 1.5 lbs.

The trigger is an adjustable unit with a two-stage pull.

The Crosman trigger testing jig gave this printout of the trigger in my gun. Note the straight increase in effort at stage two, followed by the instant release.

The trigger adjusts for the length of the first and second stages and the weight of the second stage. All it lacks to be perfect, in my opinion, is an adjustable trigger stop.

The trigger breaks like a glass rod, which is what the lines on the printout clearly show. It is an essential component of the accuracy the rifle is able to achieve. This is a trigger you can warm up to and with practice it will become an extension of your will. The accuracy of the rifle needs a good trigger like this, and this one should please most shooters

The safety is manual (Yes!) and butter-smooth to engage/disengage. You do it with your trigger finger. Back towards the trigger blade to put on and forward to take off. You can put it on regardless of whether the rifle is cocked or not.

The magazine
Well, I have now read on the internet that this magazine is a close copy of this, that and the other thing. Everyone (but me) seems to know for certain. Here is what I know. When I first tried to use it I found it confusing. Then I was told that the manual I’d been given was for a magazine on the right side of the receiver, but my pre-production sample was on the left side. So the instructions were backward, unless I looked at the pictures in a mirror.

Loading the magazine is easy, once you get the knack. Because it’s spring-loaded, feeding is always positive.

On this pre-production rifle the magazine stocks out to the left. The production model will stick out to the right.

Fortunately I discovered how to use the mag on my own, and once I did, I fell in love with it. This has to be the easiest, most positive PCP magazine around–I don’t care where it came from.

Here’s how it works in a nutshell. You first wind the magazine spring, then you advance a little bit more and insert the first pellet–which is actually the last one. The clear cover can then be rotated around the mag and you drop in pellets every time the cover aligns with a pellet chamber. It’s quick to load, very positive (as in it doesn’t spill pellets all over the place) and it advances to the next pellet positively every time. As in it NEVER jammed in hundreds of shots! Best of all, after shot 10 the mag blocks the bolt from going forward, so there is no chance of shooting a blank–the great fear of every field target competitor who shoots a repeater.

The scope and base
The Marauder comes without sights, as any good PCP does, so plan on scoping yours immediately. I asked Crosman to supply a CenterPoint 8-32 scope, which is ideal for the accuracy potential of the rifle. The scope adjusts for parallax from 10 yards to infinity and goes from 8 power for general shooting all the way to 32 power for precise rangefinding ability out to 40-45 yards.

The scope base on the receiver is a standard 11mm dovetail, but because of the magazine that intrudes from the side, you must use two-piece scope rings. I found that the barrel drooped a bit, so I also had to mount the scope in B-Sq1uare adjustable rings, so the rear ring could be positioned higher than the front.

A CenterPoint 8-32X56 scope is the perfect sight for an accurate rifle like the Marauder. This one has sideweel focus that runs down as close at 10 yards, and an illuminated mil-dot reticle to help you on both ends of the hunting day.

Well, that’s it for the description of the gun. Next time we’ll shoot for accuracy and through the chronograph, to see just how the Marauder stacks up against other PCP rifles.