If your bullet seating die is set to crimp. why would you want to crimp a 2nd time ? The rimless cases taper crimp, as a roll crimp could cause problems. If you are having problems with a particular bullet, the Lee FCD might resolve the problem. The only 2 rimless cartridges I load for are 9mm and .30 Carbine. I do not use a Lee FCD for either.

On the other hand where I reload .38 Special, .357 magnum, .44 Special and .44 magnum I do use the Lee FCD, as these are a roll crimp situation and crimp jump is bad juju. The Lee FCD give me a heavy roll crimp on these. Actually for the Specials I doubt that crimp jump is a big concern and the Lee FCD might be overkill here. I'll find out as I just bought a S&W M&P 340 and will be experimenting with .38 +P, maybe even .38 +P+.

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Hook686