What I found so far searching the net...
When I was in veterinary school at Ohio State back in the late 60's/early 70's, I spent part of my senior year shooting quail in southern Ohio with black powder double 12ga shotguns. Upon graduating and shortly after arriving in Boston to start my veterinary career, I found a couple of nice Damascus side x sides. One was made in Liverpool England very elegant but because it was Damascus also very cheep. I still shoot skeet with it and RST low pressure 12 ga shells. The other was a Mortimer percussion double barrel black powder shotgun. I never shot the gun but pulled it out of my gun safe today. It is also some sot of Damascus barrel probably made in London/Scotland or even in Boston as there was a maker Kirkland & Mortimer in the late 1800s in Boston. It was probably an inexpensive gun it it's day. Anyway I have another Black Powder gun to try. This one I'll secure in a tire and pull a string from behind a Large Tree to make sure it doesn't split the barrels