I take a factory load and use it to set the crimp on the Lee Factory Crimp die.
Then when I get the bullet seated flush. I but the round in the Crimp die, which leaves the same crimp as you have on the factory bullet.
That only works with Nagant 7.62X38R brass. I just seat the bullet on 32-20 brass where it fits the cylinder.
CPT USAR Ret
USAMU Sniper School Oct '78
Distinguished Rifle Badge 1071