Crimping for a bolt gun is really only needed if the bullet is shifting during recoil, and normally that only happens when dealing with the larger stuff.
It can offer accuracy bonuses with certain loads. I had a 22-250 barrel that would not shoot a 45gr-HP without a crimp. Crimped it would do under 1/2 MOA, no crimp it would open up to just over MOA. Was the only one I have run into so far that was that way, but I have heard a couple of others having similar results.
Big down side I found was that it seemed to wear out the necks of the brass much quicker. I would get more cracked necks and they seemed to work harden quicker.
Just some of my observations.
Bookmarks