Quote:
Originally Posted by BC38
The only concern I'd have with roll crimping over the shoulder of the bullet would be that you'd be seating them a lot deeper, and that would significantly reduce the interior volume in the case. That's going to raise the pressure. Not as much as with a 9mm, but still enough to be significant. I'd definitely reduce the powder charge to the bare minimum and shoot a few over a chrony to see if the velocity numbers line up with the predicted velocity that the book predicts for the load.
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I wouldn't do that either without adequate experimentation. Most of the time, however, if I used a roll crimp for .45 loads, I would use a bullet design with a crimp groove. Plenty of them out there, cast or jacketed.