tzone -
Elk are tough. You don't need a magnum, you need a small cannon.
Yesterday I loaded up 150g Nosler Long Range AccuBond for Daughter #1. Cartridge is .270 Win and chrono velocity using a COL of 3.460" is 2910fps.
The downrange ballistics for these are better than the 7mm RM load I used exclusively for 20+ years and again in 2015 when I took my elk at a lasered 411 yards, 4 steps and down. Recoil is calculated at about 18 foot-pounds in daughters Remington M700 BDL.
My only advice for elk hunting is "Don't wait". DYI hunts are reasonably inexpensive. And lots of fun.