Mine is giving me problems. I head spaced off my go gauge, used the tape method for the the no-go and everything was right. Tightened everything up and rechecked and that was good too. Try it on a piece of spent brass and the bolt won't shut and gets stuck. I get to looking at the go gauge and it says 308 1.600" on the side but when I measure it it comes out too 1.800". I guess the gauge is out of spec.
Can I just head space off a piece of spent brass of get another gauge?