I shoot the 300 wsm, but never factory. It is too expensive for premium rounds. If you intend to shoot mostly factory rds, then 308 is the way to go. It is a little bit slow for long range antelope, but it will definately do the trick. Many people shoot the 308 in 600 and 1000 ranges, and it is tried and true. The WSM design is very good, but like I said, their is limited match grade (if any) factory ammo available. Also, I think the WSM's barrel life is going to be about 1/3 or less of the 308, with considerable more recoil. Don't get me wrong, I love my WSM, and it is definatley a better long range round -- ya just have to decide what your prioraties are. Handloading is a very good thing to get into if you shoot alot.
I used to re-load but now I "hand-load".
-- Well, at least I try