Not elk but we took 2 mule deer and 3 Coues deer last year and packed several out in the Ute.
A boned out buck will fit minus the rack but it gets tight. I am pretty OCD about not leaving any meat on the carcass. There is not much left behind but hide and bones.
Two of the Coues came out of some awful gnarly country several miles in with not a road or trail for miles. A good set of trekking poles is worth every cent if you plan on managing heavy (+60lb) loads in steep rocky terrain.
I had the Tarahumara configured at the time but will be running a Conner pocket on the front this year. This should be a winning combination.