Kimber Montana 308 Win, 6x36LR in Talleys. And it is, in fact, my only rifle currently (though I have an M70 308 EW in the works to make a pair).
The 308 is my favorite round, and will be what I use for the rest of my hunting life:
Atta boy, Brad! My 308 is a M70 FW SS in a McMillan FW stock with a Leupie 2x7, which for me is ideal. I do 95% of my hunting with it and have no serious ideas on how to improve on it.
I coulda saved myself a lot of time and money if I'd just gone to that in the beginning - but that statement could apply to a lot of things in life.