I had one but mine had screw in chokes. I now have a double barrel .12 ga. with cylinder bore barrels. You should be ok using the standard shotgun loads of equal volumes of powder and shot, (ie) 70 grs of powder and a 70 gr measure of shot, which would be close to 1 oz. 80 gr volume of shot = 1 1/8 oz, and 90 = 1 1/4 oz. Put in your powder then either a thick over powder wad, or 2 or 3 thin overshot card wads, then the shot and an other overshot card. Only by shooting a lot of shot at pattern boards will you actually know what is the best load. You can usually tighten patterns by using a little more lead than powder. If you have a cylinder bore you can shoot a .690 rd. ball. My double shoots good with 80 grs of Pyrodex RS, an overshot wad, a lubed fiber cushion wad, and then the patched round ball. Hope this helps.