Better pack a Dirty Harry Magnum and a Bowie knife for ole grizz as a back up, no matter what rifle ....perhaps a 475 Linebaugh.

Now to rifles.....a 308 180 vs a 708 160, hmmmm, shot placement w/like constructed/SD bullets will both work IMHO, but if you rather .020 more bullet diameter and 20 grains why not bump it up to a 338 Federal w/225 partitions or TSX bullets?
Heck, a 358 even gives you more smack, well some might say get a 9.3/350 Rem Mag via Sisk rifles......all in short actions....

John, a Kimber Montana in 338 Federal might just be what the Dr. ordered. Or maybe a WSM M70 action barreled to 350 Rem Mag, set down in a light synthetic.

Dober, you can hunt with me....and be my guide wink