: I have smoothed up some barrels using firelapping and lead bullets. The worse barrel I did turned up amazingly bright. The lead bullets i used had a long, bore riding section, easily embedded with 320 grit grinding compound. The bottoms of the grooves weren't bad at all, so I didn't put compound on the base of the bullet.
: When firing roughly 40 rounds of these polishing loads, with several cleanings, the tops of the lands came out smooth, with almost no pitting at all, yet the tube looked like a sewer pipe before attempting this.
: I like your fix, though. Re-lining the chamber with a piece of chromemoly - or a coating electroplated in it?
: There is another plating, that is as hard as a file, and grey in appearance. I had a replica Sharps action plated with this. It is almost impervious to the elements.
: Unfortunately, with this porcess, perhaps even the rifling would be plated. It doesn't seem to coat the letal, as much as fusing into the surface. Perhaps this stuff would work afterall. Only the parts submersed in the liquid are coated. It is called "Metaloy" and leaves a matt surface.