I have never liked the 300 win mag and like the 7mm rem even less(not trying to start anything here so do not flame me).IMHO if I need more gun than a 30/06 it would be to shoot bigger heavier bullets not shoot the same bullets faster.The only real edge the 300 would have is at the furthest reaches of hunting distances which is further than most of us should be shooting to begin with.
The 300win mag. is about the largest round most guys can shoot which pleases the he-man found in most guys. If more gun is needed a fellow should be looking at a 338 win instead.

I still recommend the 30/06 with 165's-180's and then find the 325 hard to beat shooting 200-220's and/or the 338win mag with 225-250's if a guy wants "bigger" than the 06. Again this is just my thought on the subject,not saying I am right.