For elk mainly, it would have to be either the 300RUM or the 338 WinMag. You could choose the 300RUM because its flatter, or the 338 because its a .338. If those 2 where my only choice, I'd go with the 300RUM, and then when the barrel was wore out, I'd get a 338-300Ultra barrel for it.
If some is good and more is better, then too much is just right.
My mind is a raging torrent, flooded with rivulets of thought, cascading into a waterfall of creative alternatives