RE: .270 Win. VS. 7mm. Rem. Mag...Would I see a difference on game?
I'd split the difference and go with a .280 Rem.
I doubt that anything you shoot within 300 yards will tell the difference in anything from the 7MM-08, .308, .270, '06 or 7MM RM!
The .280 Rem. gives you the great 7MM ballistics without the magnum priced ammo!