I have to agree with Bob, a 300 RUM is better left to someone with a lot of shooting practice on their shoulder. I have shot many of the various 300's and that RUM DOES have a very noticeable upgrade in the recoil department.

I have a 300 Wby, because I came across a great deal. Before that I had a 300 WSM and it was a great rifle. If you simply must have a 300 Mag, I'd go WSM or Win Mag. In your case though, with bears being excluded, there is absolutely NOTHING wrong with a 270wsm or 7mm Rem Mag either. You'll still get plenty of power for dang near anything you're likely to encounter in NA and you won't take quite the pounding on the shoulder.