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Actually, I use .020" added to the diameter of the bullet (.010" average thickness of brass case wall thickness) to determine my taper crimp. So .358" diameter lead bullet will require .378" taper crimp to not post-size the bullet (I believe the SAAMI max is .380" at the case neck and taper out to .3811").
I am sure someone else could better explain the original intent of the FCD.
My understanding of the carbide sizer in the FCD was to remove the slight bulge that seating of bullets produced so the finished cases looked flat. While this works fine for jacketed diameter bullets, it will post-size larger diameter lead bullets. Does anyone even know whether Lee ever meant the FCD to be used for larger diameter lead bullets? My sentiment is that it was only meant for jacketed diameter bullets.
If FCD had removable carbide sizer like the Speed Die, one could get the right diameter sizer to remove this bullet seating bulge without post-sizing the lead bullet to the point of affecting bullet-to-barrel fit.
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