You have a pretty good gunsmith resource just inside BW-8 on Lumpkin St. Briley's is reknowned for their shotgun work, but they do everything. I have used them for odds and ends with good results, and they could easily clean up the M-28. I concur with the opinions that all is well, but the pics don't show what the eyeball can see in real life. I can't tell if that whitiish ring is erosion and pitting or built up lead. Either way you will wear out before that M-28 does. Take notice how thick the barrel shank is ahead of the cylinder. It's not about to fail or split. FWIW, I used to shoot nuclear level loads through my M-28 in my younger days. Nothing fazed it except bullets with exposed lead on the base. Vaporized lead would eventually build up all over the forcing cone area and require a scrubbing. It's still tight. Wouldn't do that with a few other .357's I could name.