I agree with the previous posts, the 300 WSM is quite a good caliber but my personal choice will be the 7MM Rem. Mag.

I hunted several whitetails and mule deers with it and never let me down, I also hunted black bear a few years ago....one shot one kill.

I never tried the 7MM WSM but I know some guys who did, and they are as happy as they can be with it.

Good luck with your new rifle!