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Seating and crimping can be done with the same die but should be done in separate stages. Trying to apply the crimp while the bullet is still moving into the case is an exercise in futility. I just seat a large batch and then adjust the die to crimp only and run them all through again. Having all of the cases the exact same length is nice but is a lot of extra time and effort. Do not try to apply a HEAVY crimp. It doesn't serve any real purpose and just overworks the brass and will cause it to become brittle and split. I use a taper crimp on almost all of my cartridges, revolver or auto. With good case neck tension the bullets won't pull or setback.
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