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Then there is the profile as in identifying the die as being different, it is a crimp die but I have to wonder what profile has to do with crimping.
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It maintains the 'profile' of the cartridge.
The Redding Profile Crimp die does three things for straight-walled 'handgun' cartridges:
1. Supports the case walls.
2. Crimps.
I said
three things, because the crimp is two stages. It starts as a mild taper crimp, but if you keep turning the die in, it transitions to a roll crimp.
It's nice to have, for some cartridges, but isn't a requirement.
I wouldn't buy one for .45 AR. And, I've never felt the need to buy one for .44 Mag. The standard roll crimp meets my needs.