There is an expanding mandrel which is placed in the barrel at the site of the dent and expanded while the area around the dent is struck with a hammer. This takes some time since it must be done slowly and repeatedly - expand it, tap it; expand it, tap it, etc.. When done properly, you cannot detect the repair and most often the barrel does not need to be re-blued.
Briley took a dent out of a Perazzi barrel belonging to a friend of mine. You can't tell where the dent was. I'm quite sure that they used the expanding mandrel. My friend is absolutely satisfied with the job that they did.
JPM
Based on several quick responses and the fact that there are several methods of repair, it would appear dented barrels are more common than I would have guessed.
At the risk of a dumb question, what kind of mishap(s) results in dented shotgun barrels?
My MX3 had the muzzle on the bottom barrel pushed in about an 1/8 of an inch when it was knocked out of the gun rack inside the club house at the Dallas Gun Club. It had a definite D shape to it. Some people are too lazy to walk around the rack to put their gun in it and instead reach over or hang their coat on their gun and then, from the other side of the rack, decide they need the coat and pull it up and over. That's probably what happened to my gun but with a clubhouse full of people nobody saw a thing. Jess Briley, who was at the shoot, repaired my gun and replaced the Briley tube that was in it at his shop in Houston in about ten minutes, for free. It was perfect and you couldn't see that it ever happened. Been a big Briley fan ever since.
Shotgun barrels are relatively soft. Dents occur in many ways including dropping the gun or dropping something on it. That's why I nag my friends into using hard cases. Even padded soft cases do not provide enough protection especially in a car. People are always rummaging for something and objects are frequently dropped on the gun. Use a hard case and be safe and sure!
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