Looking at the Federal site regarding the Federal Gold Medal Match for the 300 WM, you find the 190 SMK being pushed at 2,900 fps. Not that they are the king of match-grade ammo, but it shoots pretty darn good for factory ammo. As far as I know, no one makes match ammo for the 300 RUM, except a few custom ammo builders, like D&L Sports. The speed of which is, at least to me, unknown, but certainly over 3,100 fps. Having said all this, I believe there is a significant difference between the accuracy load and the max hunting load for any rifle cartridge, expecially a magnum like the 300 RUM. I believe you will likely find the optimum accuracy load somewhere between 85-95% (+/- 2-3%) of max pressure (I checked my math and my earlier statement of 80-90% being too conservative), just like it is for virtually every other rifle caliber out there.
In any event if anything is unlucky enough to wander in front of you when you have hunting load locked and loaded, its time is likely up. :wink: