May I suggest the OP study the field and its terminology a little bit?
A friend and I changed barrels on our Savages with only a Go gauge pretty much as triggerman says, except we didn't buy the Nogo to double check. The Savage board says that tightening the nut will pull the barrel back to give minimum headspace plus about .0015". Seems to work ok. I have only shot mine to 1000 yards but he has worked at 1200.
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