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Very impressedIf you want max penatration this .177 cal. round is it! Hands down. This little jewel went clean through both sides of a 4" dia. 26 gauge galvanized steel flue pipe at about 20 feet. I was using a very worn out "POS" China made Daisy Powerline 880 pump rifle with 10 pumps. I am currently waiting the arrival of the Crosman American classic P1377, I purchased online a few days ago. I can't wait to give it shot or two.