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I have the RCBS. Works just fine whenever I need it.
And even if it is a collet style puller, you'd have to crank down like a mofo on the projectle to distort it enough to have degredation in accuracy - especially in a .357 pistol round that is not going to be super accurate at distance as it is.
Crank down until the collets are snug, then start lowering your press ram. If the projo slides, reset and tighten just a hair more. You'll figure out pretty quick how much torque to put on the collet to get a firm grip without so much as a mark on the copper jacket.
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