Dennis is on the right track with Blue Dot. I've put several thousand rounds of cast 215 swc with 11.0 Blue Dot through a Smith 657. I get 1100 fps from the 8 3/8 barrel. This is an excellent, accurate, mid-range load. You can go hotter, of course. I don't recommend Blue Dot for maximum performance but for day-in, day-out shooting with loads that are above the "target-only" level, it's great.