Diamond Supporter
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I lightly crimp all my 5.56 and 300blk. Ive heard of a lot of people crimping real hard to compensate for a neck tension issue and they end up bulging the shoulder and running into chambering problems. If you're serious about getting every last FPS, getting the absolute smallest SD and tightest groups, run a couple through various levels of crimp and document your results against an uncrimped control.