The difference between a Go gage and a No Go gage is typically .004. If your chamber is set up properly the No Go gage will not close properly in your chamber. I prefer to use .002 as a target headspace. Better yet, use your Go gage with a single layer of 3M Scotch Tape (about .002) as your No Go gage. Using the neatly trimmed tape to avoid wrap around on the gage head, as your No Go gage you will end up with .001 to .0015 for your operational head spacing.
Jim Briggs
NSS
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