Shooting AT big game at 1000 yards proves one thing. You don't know how to hunt. In 67 years I have yet to meet a Deer, Elk or Antelope that cannot be stalked to within (at the EXTREME) 300 yards. Of course you have to get out of the truck or ATV............
For a HUNTER a fixed 4X scope will take any big game. If you think you must have a variable (several more things that can break or you can screw up (like having it set at 9X when that buck jumps out of the deadfall st 40 yards), a 2-7 or 3-9 will cover any all needs.
One wonders how JOC killed all that big game with a 2.5X Lyman Alaskan with a 5" Lee dot...........