It depends, the cowboy loads are about that, 850 fps. The "ruger only" loads are at or above 44 magnum level and will shoot a 255 gr bullet at 1500 fps. With black powder, the max loads I have seen with 35 gr or more are about 1000-1050 fps. Yes this is with my latest batch with better mill time. I have big lead .570 balls smashing around at 86rpm now and I leave it for 12 hours. It make a big difference.