I shoot a 139 grain spitzer for WT deer using IMR4350. Kills deer and works good on hogs as well. I can't help you with the 150 grain stuff. The 7-08 isn't much different than any other cartridge in the similar family. Lots of powder choices. For where and what I hunt, the 7-08 and the load I shoot works great. I run a Leupold 3x9 with a Firedot and CDS dial. Farthest I've shot is 300 yds but its dead on the money. Love my 7-08.
I have some 65 StaBall that I want to test some more. I have loaded a few and got great speed. Haven't done any load development for accuracy yet. Have read great reviews of it.