Ganjiro,
I had a spanish 1916 that I shot thousands of cast bullets through. I loaded a rcbs 180FN in front of 15.0 gr of IMR4198. I can't find my chronoraph records but it was somewhere around 1700 fps or so, and was a good mild loading, and it killed many, many a jackrabbit.
I belive that the lyman cast bullet manual has a similar load. I never did mess too much with the other powders, 4895 a little, but I'll have to dig through my records to find charge weights, velocities and such.
Rvtrav.