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If you are planning to load ammo, you had better buy and read a few loading manuals. Several of the reloading manuals give good explanations with pictures and diagrams. I recommend Speer #13 as a good start...
Taper crimp is what it sounds like. The die creates a slightly tapered profile removing the belling made by the expander die. These are important for semi-auto pistol feeding. You don't want edges on the ammo.
The other type of crimp is the roll crimp which are used in bullets with crimping groves, or used with wadcutter bullets over the front. Roll crimp, sometimes called profile crimp is usually used in revolvers.
Factory Crimp is a trademark name of the Lee company. Go to their website to read about them. They crimp the case and they resize the case as well, giving the round a squeeze.
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