Scroll down about 1/4 here
https://docs.google.com/document/d/1ZIo0y746UsSRZIgRuuxwAbZjSBHitO_EanvwLYc-kGA/edit

Proper evaluation requires an experienced barrel smith, a high quality bore scope and wall thickness gauge.

Superficial pitting just past the forcing cone is very common (looking toward the breech)



Linear erosions just past the forcing cone are much more worrisome (looking toward the muzzle)



IF the wall thickness is adequate, and an experienced smith believes the pits to be superficial by direct observation with a bore scope, I would not remove metal in the critical proximal 9" of barrel. I have had pits removed further down the barrel and as Stan observed sometimes very little honing is effective.

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