Is there any reason here why one couldn't FL size the brass, then follow up with a run through the collet die? I would think that this would minimize run out on the FL sized cases throughout the case life regardless of neck thickness, and keep the neck tension under better control.
The only real problem I can think of would be that depending on the case and neck thickness, it might be hard to slip the collet die mandrel into the FL sized case.
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~Mark
NRA Endowment FTW
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