Should I crimp my bullets for the .300 WM. I have never crimped and was told today by a fellow shooter and reloader at the range that I should. I suppose it would all be related to recoil and possible bullet setback in the magazine. Again, all the bullets I have been using have no cannelures. When I am accuracy testing at the range, I always load my rifle one shot at the time and never put ammo into the magazine.