I forgot to mention that my 70-grain Hornady GMX load gets right around 3400 fps--with the maximum charge of Superformance powder listed by Hodgdon for the 70-grain Speer--though I took the daring steps of rounding it off from 41.8 grains to 42.0.

Hodgdon lists that load at 3499 from a 24" barrel, but the barrel on my Whittaker Guns special is 22".

“Montana seems to me to be what a small boy would think Texas is like from hearing Texans.”
John Steinbeck