There are many good comments here and like many have stated,..
1) Use a 3.5-10X or, a 4.5-14X scope as you "may" get a 50-70 yard shot like, I just did a few weeks ago, in Ariz. The 10X, 14X, or, 16X on, the upper end, easily gets you to 700-800 yards or more, on a big animal, like an Elk. I was watching a herd at about, 300 yards up on a ridge, trying to pick out, the Bull my son saw, when another bunch came down the mountain from behind us and crossed our gulley at 65-70 yards, my scope was on 12X and I quickly turned it down to about 5X and shot 2-3" behind, the "Crease", from the sitting position, over "sticks". The 140 gr AccuBond, was still going at least, 3,100 FPS when it went thru the rib's, Lungs and clipped the Clavicle on the far side as he was not perfectly, broadside. I lost very little far side shoulder meat and he was only, lightly bloodshot around, the exit area. We lost a pound or two of meat, maximum. We like Elk Meat, so we ALWAYS shoot for the Heart Lung area, to avoid LOSING, the Backstrap Steaks or, Shoulder Roasts !
2) Get away, from the ABLR's as, they are, too "fragile" for any close shots (under 200 yd's ) as the ABLR's are designed, to expand down to, 1,300 FPS and will fragment and blow Blood and Meat, everywhere if, ANY bone, is hit! The regular AccuBond, is FINE !
3) I'd PERSONALLY use, a light enough bullet (165-180-200 grains) that, is fairly flat shooting and easy, on your shoulder, so you can PRACTICE, all the Field positions necessary to become,..."proficient" at, 50 to 750 yards, sitting position, over "Sticks" to 400 yards, Prone over a Pack or Bipod to however far that, you can REGULARLY hit, a 10"-12" Steel plate, in the WIND if, necessary ! For me that's 650 yards max with, less than a 15 MPH wind. Get a 10 mph, Wind chart made and add 50% if 15 mph ! If more than that, get way, WAY closer or, go back to camp as, an Elk is to great of, an animal to cripple and waste! As stated, by several people, MOST Elk are shot at, 400 yards or, LESS,..my son shot his Elk, here in Idaho at 250 yards. Good luck !