That's a tough one. Probably a T/C Icon - either the Classic or Weather Shield, in .280 Rem - hey you didn't say it had to be an *existing* rifle/chambering combo - I can dream!
Although, the Rem 700 Alaskan Ti in .280 (which DOES exist) would be a very very strong contender. In fact, yes, I choose it over the Icon, and it's a better answer for the hypo since it does exist now.
Scope would probably be a Bushnell Elite 6500 2.5-16x42mm, a Trijicon Accupoint 3-9x40mm, or even the 'lowly' Nikon Omega 3-9x40mm. Maybe a Swaro or Zeiss, but I wouldn't know which - I don't research them since I don't feel as though I can afford them.
Man, come to think of it, the Alaskan Ti with Accupoint 3-9x40mm would be a light, light, LIGHT combo, and could take down anything on any continent with a properly placed shot.
If you could only have one....rifle to hunt with for the rest of your earthly days
Why such simple questions? My 7mm magnum. For those who live in the easter part of the country, a 308 or 30-06 definitely makes sense. But where I'm from, you learn what a 7mm magnum or for some a 300 mag can do. There isn't a thing in all of North America that a 7mm magnum can't take down. But even though I like my 30-06, there is no way that I'm going to go after a sheep or antelope at 300+ yards with one. And yes, we do shoot at those distances. But I also admit that I've been fortunate enough to be within 50 yards of a 400-500 lb elk too. But it is not uncommon to shoot across a mountain ridge or across the prairie. I can buy ammo as light as 110 grains all the way up to 175. I can shoot coyote, varmints, antelope, sheep, deer, elk, moose, and anything else imaginable. Just can't imagine doing that with my 30-06 in this part of the country.
Hmmm, it would seem the question is not that simple after all - there is no mention of a
rifle in that whole answer. The 7mm is a chambering, not a rifle. No, I take that back - 7mm is neither a chambering/cartridge nor a rifle - it's a caliber. Which "Seb'n Mag" chambering did you mean, anyway? Weatherby, RUM, WSM, RSAUM, Dakota, Lazzeroni, STW, or one of many wildcats?