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Old 11-03-2007, 10:03 AM   #7
Trying to Get a Grip
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Join Date: Aug 2006
Location: USA
Posts: 9,910

I use Manson's gauges. I bought GO, NO-GO and FIELD direct from him last fall.

I think Brownell's has them too.

What bothers me about what you are describing is that it went from tighter than "GO" to loose enough to fail NO-GO. That's a heck of a change.

Debris (metal shavings, dirt, rust, grease) could definitely have thrown off the first one.

If it were me, I'd very carefully check the bolt logs and the trunion for any wear, cracking or bending. I'd also check the face of the bolt.

All things being equal, I think it would be pretty hard for the barrel to move. Thus, I'd look at the other areas first.
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