Over the 50+ years I've been messing with guns I've known a number of people with ringed or bulged barrels. In almost every case they shot just fine. One of them, a long time 2700 Bullseye shooter had a S&W 38 Special that got a 148g WC stuck halfway down the barrel from a squib load. He didn't notice and cranked off another one, bulging the barrel. He swore it shot better with the bulge than it had before.
I would learn to live with it if you can. It's probably not worth what it would cost (unless you doit yourself) have have it fixed/undone.
YMMV,
Dave