Seems any good gun smith could do it if he has the right equiptment....I think it would
have to be bored out and i'm not talking with a drill bit..They would likely have to use
a boreing bar...And you would probably be the one buying it as he would have no use
for it again..I know when I had a 38-55 bored out I foot the bill for borer and liner...
I would look around for another barrel if possible....Just my 2 cents worth..