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Is There a Real Difference in Crimp Dies?

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Based on some discussion about the Lee FCD in another thread, I need some education please.

Can someone to explain how the dies below differ in crimping for pistol ammo. I currently use the Lee FCD (with the knob on top) and set the crimp so the line on the bullet (if pulled) is almost non-existent.
  • Lee FCD (the one with the knob on top)
  • Dillon Crimp Die
  1. Do these crimp in different ways?
  2. Does one provide better accuracy over the other?
  3. I've seen in different posts that you should have no line, or barely a line around the bullet from the crimp. Is this true no matter what crimp die you use?
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The only way a taper crimp provides any mechl lock is over crimping & creating a ledge. Ruins accuracy & can reduce neck tension, fact. Roll rcimp, Totally diff concept.
 
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