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Old January 25, 2014, 06:05 PM   #33
Dixie Gunsmithing
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Join Date: April 27, 2013
Location: Ohio
Posts: 1,923
Jim listed what Forester had to say on their gauges, and here is on Clymer, which I use.

From the Clymer catalog on Rimless gauges:

"This style of gauge measures headspace from the breech face to some established point on the shoulder of the chamber. This point is referred to as the “Datum Diameter” and ultra-precise ring gauges are used to measure this dimension during manufacture. SAAMI generally allows .010” between the minimum and maximum values for rimless calibers. Clymer “GO” and “FIELD” gauges correspond to the SAAMI minimum and maximum respectively. Because many feel that .010” is too much variation between a minimum and maximum chamber, we also offer as standard a “NO-GO” gauge, which is .006” longer than our “GO”.

"Rimless headspace gauges for Ackley Improved chambers are made in the same precise way as our other rimless gauges. An explanation of the principle used in headspacing Ackley Improved chambers is given below.

"In the few instances where our gauge dimensions differ from SAAMI values, our gauges will always be within the SAAMI minimum and maximum and will thus provide you, the shooter, with a more precise chamber."

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In other words, if the bolt will close on a field gauge, have it looked at. No-Go is generally used to show a worn bolt or chamber from go-gauge dimensions, however someone could have reamed it to here.
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