I'm not sure exactly what velocity you're looking for, but I would think that you want it to be just shy of supersonic which puts it somewhere in the 1000 fps range.
There's lots of powders to choose from to do that, but to get consistent burn/pressure/velocity, I think you can eliminate anything slower than Blue Dot.
AA#5 might be worth a try.
Velocity in the 800-1000 range will work, but precision will be the determining factor in where it winds up. I suspect but do not know at present it's running in the 650 range with the WW540, maybe a bit slower with the 2400.
