Will,
It is the minimum barrel wall thickness (MBWT) that is key rather than the depth of pitting. The trick is to accurately measure from the deepest spot of the pit(s) to the exterior barrel wall. Using a Hosford Barrel Wall Thickness Gauge and an endoscope one can make a good estimate of the MBWT by first measuring with the Hosford gauge detent in the deepest part of the pit AND also using an endoscope to look to learn if the shape of the pit allows the detent to reach the deepest spot of the pit. Obviously this is easier said than done! Sometimes one can only estimate.
The British proof houses ream or hone the barrels' bores until all of the pitting is removed and then measure MBWT before firing for reproof.
Mark
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USMC Retired
USMC Distinguished Marksman
USMC Distinguished Pistol Shot
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