"Not only conceiveable, but people are actually doing just that- I've heard of people pushing 200 gr bullets to close to3000 fps using very slow powders such as rl-22 in the 30-06."

I have loaded the 200-grainer in the .30/'06 to as fast as I could get it to go safely with Norma N205, MRP, and RE22. It will do 2700 FPS, but with those three powders, I would not want to try for 3000 FPS with BRASS cases!! Ther may be some powder that will do it, but I do not know which one!