RE: deer gun
Bowhuntermn, I'll second the choices of a 7MM-08 or .260! They are both great deer medicine, with little recoil.
As for the 6MM Rem., with good 100 grain hunting bullets, it is also a good choice for deer sized animals but, unless you reload, you might be better served with the .243 Win.
Ammo is much easier to find for the .243 than it is for the 6MM Rem. and there is not much difference in the ballistics.