Stan,
Do you think rust and pitting could occur in modern barrels that are heavily leaded? I have hunting companions that I doubt have ever cleaned their barrels.
Most that I am aware of that are made "offshore" America are chrome lined now, Tamid, and immune to such ills, even the cheapest Turkish made guns. Most new shotguns sold anywhere are, probably. Any gun's barrel, rifles included, with chromoly steel, or any other steel that isn't stainless, and are not chrome lined, will lead and rust underneath. Corrosive primers and black powder got blamed for a lot of pits they didn't cause. Most of the worst are from leading, IMO. Every gun owner had the ability to wipe out a bore with a little oil. Not all knew to get the lead out however, or how to go about it.
SRH
