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Bill odds are it will close on a 308 no-go. They were chambered to NATO spec.Safe chamber headspace for the .308 Winchester cartidge is between 1.6300 and 1.6340 inches. The equivalent minimum and maximum values for 7.62x51mm NATO chambers are 1.6355 and 1.6405 inches. Here are those numbers in chart form:.308 Winchester: GO 1.6300, NO-GO 1.6340 7.62x51mm NATO: GO 1.6355, NO-GO 1.6405Your the only one who posted info about this so far. Everyone i questioned throws up a ? mark back at me no one really answers me with the facts so i have to do it on my own. But you knew about it.I just ordered the go & no-go 308 headspace gauges and tried them. I need the nato gauges that are inbetween the no go 308 and the field 308 next. Its a 7,62 nato chamber.