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Using the GO gauge alone won't work because the bolt will close on the GO no matter how much excess headspace is present. Using a GO gauge and tape works to make sure the bolt WON'T close, but is not very precise and takes more time and trouble than simply sticking in a NO-GO gauge.
FWIW, a bit of explanation. The GO gauge ensures that the rifle will close and operate with the longest cartridge that is within tolerances for the ammunition. The NO-GO gauge ensures that the shortest cartridge that is within tolerances will not be allowed to stretch far enough to exceed the elastic limits of the case material.
Jim
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