Establishing Headspace-Finish Reaming

[Devil Dog]

Quote:
"There are often discussions about dimensions of Forster vs Clymer headspace gauges and I thought folks might find it interesting that the Clymer reamer cuts the chamber to conform to a US GI "go" headspace gauge, while the bolt will close on a Forster "go" gauge before reaming is completed and the right bolt lug has not made contact with the receiver rail. This tells me that a Forster "go" gauge is shorter than a GI "go" gauge and that the chamber will be cut short if one uses the Forster gauge to determine when "go" headspace has been established."

Maybe I'm missing something here...You say the bolt will not close on the "go" gauge "before the reaming is complete" ...sounds right to me. It sounds like you are using a "pull through" reamer system to judge a "go" headspace gauge. Headspace gauges are far more accurate than reamers. If it were the other way around, we wouldn't need headspace gauges to rebarrel an M1. I have rebarreled dozens of M1's using G.I. barrels and have yet the see one that needed a reamer. You were just un-lucky with both of your's needing reaming.