Mike,
When Damascus and Twist barreled guns were dangerous and cheep and I was tired of cleaning up after black powder, I sent the barrels to Briley and they made a set of 20 gauge tubes for it. The chambers and bore diameter of these old guns do not lend themselves to off the shelf Briley tubes. They will make them for your barrels and I would bet that they will take the bulge out of the barrel as well.
Harry
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