This is obviously a newb question, but how much crimp do you use on your hand loads for ammo to be used in an M1a? In my bolt rifles I do not crimp at all.
The reason the military crimps is to ensure the bullet stays in place during rough handling and feeding, especially MGs.No crimp needed on any M14 bullets. Cannelures are on FMJ rifle bullets as a cheap way of keeping the copper and lead together on impact. If they line up with the case mouth, it is a coincidence.