RE: Muzzleloading shotgun questions
Having Damascus twist barrels I would be real careful about loading it. Personally I would not shoot it. It would be a wall decoration. Granted I am guessing you are sure of the integrity of the firearm. So you want to start with light loads and work up from there. The old rule of thumb used to be equal powder and shot loads. I am still testing that theory. I shoot 80 grains of APP 2f in my 12 gauge cap lock. I use an over the powder card, then a fiber wad, then 90 grains of #5 and finally an over the shot card.
The only way to find a good tight load is to experiment with different loads and different set ups. I have shot the plastic wad cups in mine and they also worked good. I am still testing different things with mine, but feel it good out to 30 yards.