In reply to:

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That's why I asked about the eccentric bushings. The idea there would be to turn the liners very thin and use the bushing to regulate by turning. The only problem that I see with this is that it lets voids between the 2 barrels. In fact this is my concern with using damascus barrels the way I want to use them. I think it would be very difficult to get a precise fit throughout the length of the shotgon bore and the liner. On top of that I don't really want to glue/epoxy them in place I'd like to solder them and realisticaly it would be about impossible to assure full solder coverage.

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I talked with a barrel liner maker about regulation, and he suggested the following: One insert is installed, essentially "straight", and the other is turned slightly eccentric. Then the eccentric bbl could be rotated as necessary to regulate to the "straight". While I don't think this is the "best" way to regulate bbls on a double rifle, it would "work" if your personal tolerances weren't too "tight". However, I bring it up for two reasons. First, I'm not sure you'd need to turn the liner too thin in order to put an appropriately sized shim in-between a smaller-than-bore-diameter liner and the bore. A few thousandths should suffice I'd think. Second, I feel comfortable saying that I could turn a liner to a very snug fit from breech to muzzle, and in doing so, would feel comfortable soldering (or gluing) the liner in without worry of voids.

Paul

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