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snuffy wrote: For the handgun calibers, it's a taper crimp die.
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Careful now - I made the mistake once of believing this, when there's actually a little more to it. The Lee FCD for handgun calibers can be either a taper crimp or a roll crimp depending on the caliber. It varies just as you'd expect - 380 ACP, 9mm, 45 ACP and the like are taper crimp style FCD's, with 38 Spec/357, 44 mag, and other revolvers cartridges having a roll crimp style FCD. Here's Lee's official wording on their web site:
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Lee Pistol Carbide Factory Crimp Die - A carbide sizer sizes the cartridge while it is being crimped so every round will positively chamber freely with factory like dependability. The adjusting screw quickly and easily sets the desired amount of crimp. It is impossible to buckle the case as with a conventional bullet seating die. Trim length is not critical so this extra operation takes less time than it would if cases were trimmed and chamfered. Revolver dies roll crimp with no limit as to the amount. A perfect taper crimp is applied to auto-loader rounds. The crimper cannot be misadjusted to make a case mouth too small to properly head-space. A firm crimp is essential for dependable and accurate ammunition. It eliminates the problems of poor ignition of slow burning magnum powders.
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About the middle of the page here:
Lee crimping dies