Lyman 358071, 145 grain round nose, .030 card wad, on top of 12 grains of GOEX FFFg, manages about 650 fps and is quite accurate in an 1894 vintage Iver-Johnson Safety Hammerless. It'll knock down "Pepper Poppers" without trouble at 15-20 yards while the flame and smoke bewilder the RO. I haven't fired over a hundred rounds at a time so can't say when fouling becomes a problem.
Same bullet over 2.5 grains of Bullseye is just the ticket in a Colt Banker's Special. It doesn't much care for the "Holy Black."