As mentioned, the 7mm-08 doesn't have the case capacity to really push the heavier bullets effectively (especially hunting bullets). I have two 7mm-08's, one that I use for deer and the other for shooting steel/paper. I stick with 140's in the hunting rifle, and shoot 150-168's in the heavy barrel rifle. I've seen some pretty good numbers with Winchester 6.5 StaBall powder, Hodgdon lists it at over 2700fps with 168's...may be worth trying some out. You have plenty of barrel length, but I just don't see the point using such a heavy bullet when there are comparable bonded bullets that will perform pretty well in the 140-150gr weight.
That being said, my next 7mm bullet will be 500 of the Nosler 168gr 2nds Custom Competition HPBT's. Not so much for the weight, but because they are reasonably cheap at $20/100.
