Heavies, Never ceases to amaze me the number of "think outside the box" people we have here. :) I had to stop and scratch my head on this one! However, using the headspace gauge to set-up your f/l die would not allow you to move the shoulder back any further than the measurement your chamber was set to. Unless you milled a few thou. from the end of the headspace gauge which would render it useless for any further chamber headspace setting/re-setting. Keep in mind also that your 6mmBR F/L die is machined very precisely to give you minimum cartridge headspace when set firmly to the shell holder. You could buy a cartridge head space comparator to fit to your dial caliper to determine how far back your shoulder is moving upon sizing. (see how expensive this hobby can get?) Or, you can just go ahead and shoot it and take problems (if any) as they come! Good luck on your project, Dale
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