Nothing has been mentioned about the condition of the bores, today, or, if a good ‘Smith has had a look at the condition of the gun, overall, and the condition of the barrels in particular. Damascus is not my cup of tea, but, many use such guns every day. I believe that a good gunsmith, one familiar with English guns, proof, reproof and Damascus barrels should probably have a look at it. Kirk Merrington is retired, but, takes on projects that interest him, and this would be right up his alley.
I’m guessing that a gun that checks out OK for low pressure ammunition of the 2 1/2” variety will actually be OK with low pressure 2 3/4” ammunition. The difference in pressure is slight, and it is easy to use off the shelf components to produce what you need, which, can be used in doubles that do not have a low pressure requirement.
But, take the gunsmith’s advice.
Good luck.
Best,
Ted
