Well, I have a bunch of 240 cast LBT's loaded over 5 grains of bullseye. They do 740 out of a 4" bbl and are very pleasant to shoot. Surprisingly, they hammer whatever they hit much harder than you would expect from that velocity. I would think that 6.5 gr of Unique would do about the same. I usually shoot 7.3 grains of Unique under a 240 cast bullet for about 850 most of the time. For defence I load 8 grains of Unique with a 200 gr jacketed hollow point. That's a great load in my 3" Charter! 44 Man