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If the Lee .45 crimp die is for 45 colt (or "long colt"), it will most likely roll crimp, which is not correct for 45acp.
Lee factory crimp dies are for specific cartridges, not just the caliber of the bullet. So a FCD for 45 colt is different than a FCD for 45 acp. FCDs for straight wall pistol cartridges have a carbide post-sizing ring that irons out any kinks in the case caused by crimping an overly-long case too much.
If you occasinally trim brass to keep it more or less uniform in length, crimping while seating is not all that hard to set up, and saves a step on a single stage press. On the other hand, if you are picking up range brass from who knows where (not something I particularly recommend), and don't trim them to uniform length, the FCD can save a lot of frustration.
Andy
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