I need the benefit of some expert experience. Have slight bulge about 15 inches from breech on one barrel of an old Superposed. Not a ring bulge. Ribs do not seem de-laminated. Do not know the history of the gun, or how the bulge was produced. Can it be repaired? If so how. Should it be repaired? Any comments on resulting strength of such a repair if it could be done. Is this all that much different in concept than repairing a dent. Any recommended gunsmiths for this repair? Thanks