I use a .308 LEE FCD with a simple height booster I turn out in a lathe.
There is no magic in the setup, the neck size is the same, only the case have different length. so turn out a piece of plastic so the whisper is suspended at the right height when the loader ram touch the bottom of the die.
As the ram pushes the crimper part, it also push the cartridge (on the booster seat) and does the crimp. No sweat :)
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