I was just talking to Ripp about the perfect rifle for that criteria - a 6.5/284 and you can include 400yard elk into that equation as well, given the proper bullet, of course. A 130gr. TTSX or MRX would probably do for all.

For a Ross - a 4X would work just fine. I do like my Fullfield 3-9 Burris, though, with the stadia wires - for either rifle.