Agreed! When I first started reloading, I was using G.I. M2 bullets I got from the DCM, and despite the fact that they have crimping cannelures, I was never able to crimp them without bulging the shoulders to where the cartridge would not chamber. I have never really tried to crimp rifle cartridges since then, but of course crimp heavy revolver loads. I now crimp pistol ammo as a separate step, after seating the bullets. I back out the seating stem, and then screw the die down to touch the shell holder and apply as much crimp as the die will put on 'em. Generally this is with lead bullets, where buckling cases is not such a danger. But with jacketed bullets, I only apply as much crimp as the depth of the bullet's crimping groove will permit.