RE: 7mm mag vs deer
I hunt whitetail in Pennsylvania with .300 Weatherby Mag - very similar energy/ballistics to 7mm Mag. I have friends who love their 7mm's.
I don't think we use "too much gun." A broadside lung shot with a pointed soft point core-lokt will yield a relatively small exit wound, as it would with any other caliber.
A direct hit into the pelvic girdle or entry into spine/shoulder socket will yield more significant damage. The same would be the result with just about any other caliber.
It's a great all-around gun, and you won't have to worry about buying or borrowing something bigger for any hunting trips or bear season. It gives you great range with fantastic conservation of Kinetic Energy (knockdown power).
I've had great luck with my .300, and I wouldn't hesitate to hunt with a 7mm.