I really can't imagine not having & loving a .308 caliber rifle. The .30-06 can be beat, and the .308 is almost as good. The .270 & .260 are pretty good deer rifles. The .30-06 is a good everything rifle. I just love this quote by Col. Cooper.
"I have long taught that if you can't do it with a 30-06, you probably can't do it. Every time some new brass powder bottle appears for sale, all sorts of people, qualified or otherwise, leap into the breach to explain how this new round is somehow better than what has gone before. Whether it is better or not must depend upon what it is designed to do, and it is effectively impossible to say that a shooter accomplished his purpose in the field with the new cartridge in a way that he could not have done with a 30-06. As it is said in Lindy Wisdom's verse: "There ain't many troubles that a man can't fix with seven hundred dollars and a thirty ought six." We do not know about the $700, but we do have confidence in the great 30-06 cartridge.
The Steyr Scout, which is now pretty much the definition of what a sporting rifle should be, is furnished in 308 rather than 30-06, but that is simply because the slightly smaller 308 cartridge can be fitted into a slightly smaller action, which has little to do with what comes out the muzzle. The 308, in modern loadings, is the ballistic equivalent of the 30-06, apart from its failure to accommodate the 220-grain bullet, which has definite, if minor, advantages for the medium-size hunting of medium-size animals."
Col. Jeff Cooper