I have worked up .257 loads with IMR4895 and the 75-grain Speer flat-nose jacketed bullet that got around 2000 fps, and shot right at point of aim at 100 yards with the bull-power deer load sighted-in a couple inches high. They worked great, not shooting up much meat and putting turkeys down quickly--and are also very different in appearance than deer loads.
The exact velocity isn't important, and in any rifle the powder charge would probably have to be manipulated a little to get the point of impact right. A good starting point is around 25 grains of powder.
