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I seat and crimp in one step (taper for SA, roll for revolver) and I've never had any issues -- made some reasonably accurate ammo as well. That said, the reason I do the combined steps is that still, after 25 years, I load on a single stage press I don't want to add another die change to the process. I'd probably split it up if I had a turret or progressive.
I never tried the Lee FCD on pistol loads but I did try it on some rifle loads. After spending a lot of time processing some pretty expensive rifle brass (trimming, case neck turning, chamfering, tempering), I was sort of disgusted with what it did to the case mouth -- the brass at the mouth was crushed inward in four quadrants leaving a brass ridge between each quadrant. I didn't get any better velocity or accuracy. Now it collects dust. Maybe the pistol versions are different.
I never tried the Lee FCD on pistol loads but I did try it on some rifle loads. After spending a lot of time processing some pretty expensive rifle brass (trimming, case neck turning, chamfering, tempering), I was sort of disgusted with what it did to the case mouth -- the brass at the mouth was crushed inward in four quadrants leaving a brass ridge between each quadrant. I didn't get any better velocity or accuracy. Now it collects dust. Maybe the pistol versions are different.