I just measured some of my 45 Colt loads with a caliper. Most of my Cast bullet loads are crimped "about" .020 the best I can tell. I can't measure any jacketed loads, I don't use them. I actually don't normally measure the crimp, I just kind of know what it takes if that makes any sense. I guess a rule of thumb would be to crimp until either the case or the bullet starts to deform, then back off a little. Sorry I can't be of more help.
