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I crimp in a step itself. Seat first them come back and crimp, just me. I don't shoot competition, but I do want reliability and accuracy. The reason is as Mike stated, I don't trim my auto cases do to the shear volume. I do however seperate by headstamp. I have found that seating and crimping in one step will cause oal's to vary by 10 to 15 thousandths. The reason is a longer case will crimp on the bullet sooner causing a longer oal. And possibly gouging the jacket or bulging the case or both. I'll seat, back out the plunger and then run 10 or so to get the feel of the lot i'm running. I'd much rather have a little to light or to heavy a crimp than jamming a crimped bullet to its resting spot. Again, just me.