Nope,I said the bolt WILL close on the Forster "go" gauge before reaming has been completed(as indicated by the bolt lug making contact with the receiver rail). The bolt will only close on the GI "go" gauge after reaming has been completed,which is the desired outcome. I think that I am correct to deduce that the Forster "go" gauge is shorter than the GI gauge on the basis of this experience. I don't have a Clymer "go" gauge and would like to have done a check with one of these as well. And yes, I too use headspace gauges as the definitive indicator of headspace status.
By my records I have now rebarreled 24 Garands, including 6 with new GI barrels. All new barrels and one used barrel have required reaming to establish the proper headspace,altho both of the previously mentioned SA 4-52 barrels would accept the "go' gauge w/o reaming when a worn bolt was trial fitted. In the case of my recent installation I wanted to match a correct bolt to the receiver, so I did not use the worn bolt which was a mis-match.