I contend that the only choice would be a 30-06 bolt action with a 2-1/2--8 variable powered scope and backup iron sights.
Unless, of course, a lot of varmint hunting were contemplated. In that case, it would be a .270.
We don't hear much talk about the so-called "all-around rifle" any more because, as JB has pointed out, nowadays we have more money and can afford rifles for different purposes. While having one rifle might dictate a 30-06, many who have several don't need a 30-06 or a .270.
And if you could only use one bullet in your 30-06? I would pick the 180 grain Nosler Partition, again not considering varmints.
Either a M70 Classic stainless or Ruger Mark II stainless, aftermarket stock, iron sights, a 1.5-6x42 with additional 2.2-10x42 or 50mm and 1.1-4x24 or 1-6x24 (or 1.7-10x 42 and 1-6x24) in 338 Win Mag.
I would have more indecision on the scopes than the rifle or cartridge. I would definitely want a higher and low powered scopes though. For my hunting a moderate velocity .308 -.338 would work fine. No hesitation on the 338 Win mag with 225 TSX and/or TTSX.
