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doctor j
I've never actually used the Lee carbide factory crimp die (but I do use their carbide dies for .44mag) so I don't know about how they affect performance. The factory crimp die does have a few things to offer though. First of all, it forces you to crimp separately from seating (which I would suggest you do even with the roll crimp). Secondly, it post sizes the cartridge. Thirdly, it will provide the same crimp on each case. With a roll crimp it is important that each case be the same length to get the exact same crimp on each round; case length will not really affect the crimp using the factory crimp die.
As I said, I haven't used the factory crimp, but I would think that you might get a tighter crimp with the roll crimp. That could be a factor in performance using powders like W296 or H110. Just make sure the cases are all the same length and you should be good to go.
BTW, I just started loading a bunch of .44's for the very same reason. What loads are you considering exactly?
Jack
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