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Up to about 1000 fps it doesn't take much crimp if you're expander isn't too big. You won't be going much faster than that with Unique.
I use Unique and other mid-burn powders with 158 grain plated bullets, and I never had a problem with bullets pulling. I use the Lyman M die to expand and flare my cases, and just a touch of a profile crimp.
Flare as little as possible.
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