I should think the .280 Remington in that 700 mtn. is a darn good pill.
If you want total flexability, go for the 30-06 in the 700mtn. Using Hornady light Magnum 165gr 30-06... it'll hit harder than a 7mmRemington short mag. 150gr.out of that 22" bbl. with just a tad more trajectory.