A nit about this crimping business....

In an auto cartridge, the purpose of "crimping" is to undo the flare/belling when the case mouth was expanded before seating the bullet. Crimping does not make the case grip the bullet tighter and prevent setback, it makes it worse. This is the purpose for taper crimp dies for autos - they don't really crimp at all, they just remove the flare.

If you are having bullet setback issues, the most likely reason is too much flare, not insufficient crimp (or thin UMC Remington brass).

I load a lot of .45 auto, both lead and hardball, and I've learned to expand the case mouth just barely enough so I don't shave bullets, and apply barely enough crimp (with a taper crimp die) so the loaded cartridge will drop freely into the chamber, and drop back out again when tipped up. I've also quit using Remington brass in my autos, I get setback no matter what I do.

Roll crimping for revolvers can't really be compared to taper crimping for autos, it serves a different purpose.

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