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Crushing cases is why I originally started crimping in a seperate step.
I put a case on the shellholder, run the ram all the way up, then I screw the seating die in until it touches the top of the case with the stem screw out until I can see threads. Usually, I back the seating die out about a 1/2 turn and lock it. It's usually enough to get the bell out of pistol cases, but won't crimp. Seating depth is easily control by screwing the stem down.
All the crimping is done with a Lee factory crimp die for both rifle and pistol, which is pretty easy to adjust.
I've loaded thousands of rounds this way. No problems. I've never crushed a case since.
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