20 gauge F.d.C. or Early Virginia Smoothrifle, both get 85 grains 3f powder, 2 thin over shot cards, then a lubed felt wad, then a premade paper shot cup/cartridge containing 1 1/8 oz #5 shot, topped off with another thin overshot card. Soon to possibly topped off with a heavily lubed traditional cushion wad.
But, as has been said, you need to find out what your gun patterns best with.