Regardless of what powder you use, you ain't gonna be able to hot rod an '08 in a meaningful manner. Why not just switch to a good 160 at @25-2600fps and go kill an elk?
well.... I know my rifle likes 150's and I'm pretty sure that's enough, weight wise to get the job done.
I would just like to boost the velocity a little bit, if I can without compromising accuracy. The extra velocity would actually help flatten the trajectory a hair, and extend the distance at which the projectile ought to open.