I just bought a H&R Huntsman in 58 cal off of an internet seller. Unfortunately, the barrel is badly pitted and the breech plug has been corroded by the fouling too.  I did the best I could to clean and polish that bore but it's a gonner.  Does anyone bore and line these barrels?  I'd like to keep it at 58 but would go to 60 if that's what it took.
R J Talley