My load for my Ruger Vaquero with the same barrel length as your BH uses a round nose, flat point lead bullet pushed by 4.0 grains of Trail Boss. I haven't chronographed it, but it's a powder puff to shoot, very accurate, and hits point of aim of my fixed sights out to 25 yards (I'm sure even further - but my indoor range goes to 25 yards.).
I took maybe a 7 yard shot at a mid-sized cottontail with this load and purposely aimed behind the shoulder vs. the head just to see what the load would do. The meat and fur damage was minimal. The rabbits I have taken with .22lr hollow points had far more mess to deal with than this particular .357 Mag. load.
