Using various sanding blocks to provide a rigid backing and all cloth backed abrasive, I went to it in order of 80 grit, 100, 120, 150, 180, 220 then finally with wet sanded with 320 grit with oil. 80 and 100 grit are the only grits that really remove any material, the others did a great job of smoothing out the marks made by the 80 and 100 grits. Some deep pits required the use of a smooth file with light strokes so remove some of the pitting. I apologize for the crumby iphone pics.
Being careful to stay away from any engravings on the barrel, as I do not want to send the barrels out to have the engraving re-done. The barrel had some heavy pitting underneath the rust on the first picture.
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