I purchased a 300WM a couple of years ago. Had always used my 30-06 for everything including elk. Like previously said, the 300 hits hard. I have only killed a few animals with my 300 but they didn't go far. I have a moose hunt coming up and am looking forward to seeing what it will do on a moose.
Incidentally, check out the Weatherby Vanguard Series 2. It's a very accurate rifle that is well priced.
Good luck . . . Rob