That's for sure. I got flawless results (not a single jam, and some pretty forceful ejections in over 100 rounds fired) using UMC 147gr FMJ ammo. The last I went out, I used 115gr and 124gr ammo, and the jamming was continuous. Looks the artillery will be on a 147gr UMC FMJ diet from now on!
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markm3
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