If you really blued the barrels by modern hot dipped salts you have very likely ruined that set of barrels. The lead based solder used to attach ribs and lumps is not compatable with the bluing salts and the barrels may look nice now, but the ribs may soon loosen. If there were any leaks in the ribs those caustic salts are still under the ribs causing corrosion. If you had asked here about appropriate methods we could have helped. Rust bluing would have been safe and proper for refinishing barrels of a vintage SXS. If you don't know what rust bluing is I give up. A fresh coat of Rustoleum would have been better.
