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barrel constriction

  1. barrel constriction where it mounts frame.

    S&W Revolvers 1945 to Present
    I have a 1967 K-38 Target Masterpiece m 14-3 that has a constriction in the barrel at the point where the barrel threads into the frame. I discovered this when I slugged the barrel to determine what diameter cast bullet to use. The cylinder throats are .358" I don't know what the last 5...