With heavy cast bullets, I assume you are speaking of a revolver, not an autoloader. If so, bullet pull, not setback, is the issue, and controlling neck tension while crimping is key.
The Redding profile die has a progressive crimp ring that smooths out the case mouth bell before starting to roll the crimp. An agressive roll crimp without buckling the case is easier this way.
The Lee FCD does not; it has a standard roll crimp ring, and a post-sizing carbide insert that irons out any buckles caused by a misadjusted crimp. The problem with this ironing process is that brass bounces back more than lead, so it leaves the lead bullet undersized inside a case neck that has bounced back some. Not good for neck tension. So, if the FCD actually does anything more than crimp, it reduces neck tension. And it does not have as good a crimp ring in the first place.
Personally, I like the crimp put on by my Hornady seating die (while seating the bullet, no less) better than that from my FCD for 45 colt, but I don't use heavy bullets.
Last edited on 11 July 2008 03:52 AM by BigJakeJ1s
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