I crimp revolver ammo. I taper crimp pistol ammo. I taper crimp my 45ACP ammo to .469” as measured on the case mouth.
I do that for function. My handgun ammunition is plenty accurate and crimping does not seem to effect accuracy.
Handgun ammo that shoots within two inches at 25 yards is virtual match accuracy. I think the standard for Bullseye shooters is two inches at 50 yards.
If you can’t shoot two inches at 100 yards with a rifle, something is wrong. (Lever actions and AK’s excepted)
I don’t crimp rifle bullets. I don’t crimp any of my AR, M1, or M1a match ammo. The picture is of what happens if you over crimp 6.5 SMK bullets with a Lee Factory Crimp die. You can do this without knowing. Why mess up a perfectly good rifle bullet with crimping?
Maybe you need to crimp for elephant guns. Got any elephants in your area?
This weekend, the elephants in the Sugar Bowl, the Utes made them into moccasins.
I don't want to think about it anymore.