RE: 7mm or 300mag?
I was faced with the same decision and went with the 7mm mag just because i liked it better. Just which ever fits you best and which one you like better. they will prolly both do the same things, but a .300 mag might give you a little more variability in bullet wieghts as well as let you hunt as big of game as you want.
"A man with a gun is a citizen, a man without a gun is a subject."