The Hogdon load data center lists 7.1 grains of 231 as maximum for this combination, so 9gr sounds a little umm optimistic. They also list separate loads for Ruger Thompson Center and Freedom arms only but all these use slower powders and 231 is not among them. With the safety nazi lecture out of the way, I have tried 13.5 grains hercules blue dot and 250gr lswc. This was one of Elmer Keith's loads for 45 colt. It worked well in my Ruger Bisley Blackhawk, very accurate. Play safe...