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you supposed to have ram in upmost position and screw FL die in untill it makes firm contact with die then turn it 1/4 turn down more (assumably to take up any slack)

back to manual..
to set the...

those arent flat......well only a little...
so what I do when setting up dies..as per OLD Nosler manual is to set up the full length die as per normal BUT instead of screwing it DOWN the extra turn...