I THINK you would be better served with a bullet/load combo dedicated for BP. Pins are relatively close & are no risk to your life, so no real need for THE HOTTEST/FASTEST. See what you shoot fast & accurate. For centerfire revolver I alternate between a model 10-6 (38 special only), and a L frame model 681 (357), but use the same 38 special 148 gr DEWC cast boolit seated flush in either gun, & it is surprising how hard they hit both BP's and steel plates with only 2.7 grs of bullseye. Recoil is unnoticed, & they are able to be shot fast & accurate. If I could find a 180 gr DEWC for 357, I would certainly try that, but not push the velocity envelope, no need to. It is such a fun event it really doesn't matter what you use, or if you win, to me. anyway.