I should just have it well checked and appraised. It's surprising how many Damascus barrel guns will happily stand re-proof to nitro and chambers lengthened. I had a single barrel gun with Damascus barrels that was a very early example. It had started life as a black powder proof 16 bore then had the barrels lapped out at some stage to remove pits and actually re-chambered to a 12 bore and then passed nitro proof. It's nice gun and a good example of its kind. Why not just load black powder ammo? Much more fun than nitro; except more trouble to clean afterwards. After all, guns are for shooting. Lagopus.....