I am not a fan of the rifle FCD, it swages perfectly good bullets in the middle and that is not conducive to long range accuracy
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The pistol Lee FCD is something else, not quite a roll crimp, not quite a taper crimp. I use the ones I have and crimp the heck out of my pistol bullets.
Handguns are spitting distance weapons anyway, the furthest I shoot is 50 yards with them, I am more concerned about 100% reliable function in a handgun than what I am doing to the bullet. Maybe it makes a difference in accuracy in a handgun, but it will take something like a machine rest to find out.