What's the TIR of this runout? You want less than .003.
Try this, seat the bullet 1/2 way, lower the ram and rotate the cartridge 180*. Then finish the seating.
Widder
I have used the Lee FCD on my FA .454 Casull since 1997.
Never had a bullet hold issue.
What is your source for that information? Do you have a link?
I use the FCD on all of my handgun ammo and have need seen this issue.
NO FILLERS!
Use enough powder to compress 1/8-3/16" with a .060 fiber wad when bullet is seated.
DO NOT COMPRESS WITH THE BULLET!
Plan on using a blow tube for fouling control.