I would look hard at the Nosler Accubond in 140gr. He will be able to get a tad more velocity than from a 150gr bullet and have more retained weight than the 130's.
I personally have never shot an elk, but know and hunt with folks who have. They used a variety of calibers and bullets through the years and none were any of the so called premiums. They all seemed to haul meat home from every trip and the only magnum used was a 264, years ago, and that load was with a 120gr bullet. Most of them use a 270 or 30-06, with bullets going from 130grs to 180grs using what ever shot best in the rifles. Most of their shots are within 200yds or less, with the majority being around 100 or so.
Good luck in your hunt, have fun and be safe. One thing they always said about their trips, it was always easier to start high and hunt down the mountain, easier on them and getting the game out. Also consider where your at before dropping the hammer. If you can't pack it out from where it hits the ground, it isn't worth shooting.
Just some tidbits from folks who have done it for the past 25 years or so.