You could easily put index marks once you have the headspace set the first time around.You would have to scribe a fine line out past the end of the nut so you can check it once the nut is tight.When tightening you have to be aware that the barrel alwys moves alittle which ends up being slightly tighter haed space.As far as loads go they should repeat pretty well as headspace doesnt seem to goof with loads that much.Just take your time when switching back and forth and keep notes as to how you set it up.
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