I hate to be this guy answering your question with a question, but I need to ask is why a 300 WM?
Lots of guys think they need a 300 WM because its just better for long range shooting, and it is not.
Recoil is a major concern and anyone who shoots long range knows that there is a limit to how much recoil you can tolerate, especially if you shoot alot.
Accuracy is another point. First, it is more difficult to shoot a heavy recoiling rifle as accurately as something more moderate, but more importantly is accuracy expectations at long range.
The only practical reason a guy should want a 300 WM is for the down range energy. If that is the reason you feel the need for such a rifle, that's cool, I have no problem with it.
If you just want to shoot long range and hit stuff, well, you can get smaller groups with a wide variety of more practical calibers.