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Thanks guys. What is better about the Lee crimp die?

I am the soon to be new owner of a Dillon RL 550B (got it on Ebay last night). While reading the Dillon manual and website, I noticed that they crimp the cases differently. The Dillon crimp with a separate die, while the Hornady crimp with the seating die. Dillon says they crimp separately because they get a more uniform crimp and you don't have opposite forces acting on the cartridge (down on the bullet and in on the crimp). They also say that their dies are more funnel shaped which tends to feed better in the Dillon.

Does anyone have any experience with this? Also, I don't crimp 45acp at all. I was told or read that because the case shoulder seats on the chamber wall crimping will cause jams. Should the 45acp be getting some amount of crimp?

Also, what about .223/5.56 how much crimp should these cases get?

Thanks for any help!

Monty