The rpm I use on the press clocked at 480. When spot checking crimpers on hulls I actually use that same setting from .410 all the way to 8 gauge. You may need a different one again. The main thing I would stress is use lube. I use tap magic when making and checking crimpers simply because I'm in a machine shop and it's there. Gun oil would work too. A small drop will do. I dab of Vasoline from a q-tip inside the crimper will last for a few shells before needing to add more. By the way if you like watching youtube videos Jeff of Taofledermaus uses my crimper exclusively. Look up the "Tsar Bomba" slug video he put up a year or so ago.
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