Thread lift!

Im stuck between 7-08 and 284 for my next build. It will be a 90% deer rifle but i also want to be able to shoot target with 150-168 grain vld's. Bl is 24 with 9 twist. I was at 7-08 but my mag accept 3.0 OAL cartridges so i begun to look at 284. Then i realize you have to fill it up with a whole lot of more powder to get not so much more velocity than a 7-08 if bl is a 24!? Anyway it feel like the 284 will handle 168 way better than 7-08 but again it takes like 7-10grains more powder. I just dont know, 7-08 with 3.0 OAL could be good too...