You can use one to fix rounds that fail to gauge or go into battery or you can just put it on the press and pretreat every round. It is kind of a crutch, since so many claim they don't need one, but if use of a combination seat and crimp die has become maddeningly difficult to get just right, the FCD will save the day.
The FCD is not recommended for lead bullets because it anticipates and forces bullets to be jacketed diameters. Lee does little to accommodate loading of cast bullets. For that I use RCBS and Lyman Dies plus a couple specialties from Redding. I keep a separate setup for jacketed/plated, most of which I do on a Lee turret with some Lee dies.
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