9.3x62,

There is some modern handloading data available for the 9.3x62, but only from certain gun writers (and the magazines they work for, notably HANDLOADER). The 9.3x62 can easily push 286's to around 2500 in a 24" barrel at 60,000 psi or so. The load I generally use is around 65 grains of Ramshot Big Game, but several powders will do it.

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