Originally Posted by eaglesnester
Only necessary if you have a automatic weapon or if you have a hard kicking 375 Ouch&ouch or bigger. Crimping does not effect accuracy, just as not crimping does not effect accuracy.
Crimping can and does affect accuracy as it also affects velocity. I little roll crimp never hurt anyone. All Ar or semi-auto rifles I would crimp. For bolt guns try some with and some with out and see which shoots better.
Crimping will affect accuracy if your case neck is not true if you have a neck with .002" more material on one side vs the other then your going to have more crimp on that thicker side causing forces to be applied differently to case, action and barrel.