or.....hacksaw a slit in neck of a case...seat projectile in slit case.....chamber round..the projectile SHOULD slip back in as being pushed by rifling...take it out..measure it...do it half dozen times.....take your average measurement and call it the jam measure ment...make it however much shorter you want to be from rifling.......load up a hundred rounds then realize the loaded rounds are now 2mm too long to fit in magazine LMFAO...
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