Steel barrels are often easily repaired with a hydraulic dent raiser. But unless you intend to do several it is much cheaper to ahve them raised by a good gunmith. I do my own but that is beacuse I like many others here buy project guns that need several dents removed and have saved hundreds of not thousands of dollars by doing my own.
Damascus dents can get a little tricker and should be done by a pro. I have seen two sets of barrels that were ruined by a haudraulic raiser and the ham fisted amature.
