C H
1. First, the 308 comes close but TODAY the 06 can out do it especially with our newer powders.
2. I would NOT say any one would fill your bill. > "but can't think of one cartridge that works better as an all-around option."
3. IMO and for MY use & possible hunts in the future......
I'd take a 7 Rem Mag. There are plenty of GOOD bullet choices for the caliber LIKE th 30 Cal.
*** I like the 7s flatter trajectory *** THAT is the only reason. ! Dead is Dead, but flattER is better AFAIC.
Jerry
I use both my 7mm RM and .300WM individually more than all three of my .30-06 rifles combined. I like flatter. 
Coyote Hunter - NRA Patriot Life, NRA Whittington Center Life, GOA, DAD - and I VOTE!
No, I'm not a Ruger bigot - just an unabashed fan of their revolvers, M77's and #1's.
A good .30-06 is a 99% solution.
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