I would go with the 30.06 over the 7mm mag simply because the 7mm is a mag.
No need to take the recoil with such closely matched calibres.
Now if you ALREADY had a 30.06 or even a ,308 then I would go with the 7mm mag because......well, you need one if you don't have one !! right?
Elk have been killed close to roads where they could be loaded whole into the bed of a pickup. But it doesn't happen often and I'm not sure that is the experience that I long for. The type of elk hunting that I prefer requires rigorous physical exertion that can cripple someone who is not in shape. Being a college hockey player I have to be in at least fair physical condition most of the year but when one of my buddies got back from the Navy Seals he changed the way I think about physical...