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A decent crimp on revolver rounds is critical for ball powders, less so for faster/flake propellants. I crimp as a matter of course for 38.357, 45Colt, and the 44s.
I roll-crimp in a separate operation from seating for revolvers -- and only into a deliberate crimp groove already in the bullet.
With jacketed I'll crimp and additional 1/3 turn from first case mouth contact.
For Lead I'll crimp a full 1/2+ turn
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