Either of these calibers has plenty of accuracy potential for big game hunting. What we are looking at is the shooter's ability to shoot the 7 Rem Mag as well as the 7MM-08 due to the increased recoil. A 7MM-08 in a medium weight sporter is an extremely pleasant CF rifle to shoot. Hence, folks tend to shoot it well. The 7 Rem Mag might have close to twice as much recoil. For quite a few folks, its enough to cause flinching.

In my way of thinking, the 7MM-08 is a 300 yard gun. You can sight in 3" high at 100 yards and only be about 4" low at 300 yards. The extra speed of the 7MM Rem Mag will extend that distance about 75 yards or so, depending on the load. Most rifle hunters have no business shooting beyond 300 yards anyway - so I'm recommending you get the 7MM-08. If you decide you don't like it, they are real easy to sell.