If your going to do long range hunting you need a place to practice your long range shooting. A flat range won't do very well. I expect I quarter section would be the vary minimum set up very much like a golf course but with shooting positions that let you take shot at targets from 100 to 1,200 yards at many of the targets as you can. Finding land with natural back stops and open shooting paths is going to be hard. On the bright side it should bring in a reasonable amount revenue if you made it a sooting range. A square mile with 2 or 3 large washes running through it would be a more reasonable size. It would be best if it were in the western states so there were prairie dogs, coyotes and jack rabbits to shoot. Feral hogs would come in a poor forth because they stick to cover and come out at night.
I looked a .338 Laupa with a muzzle velocity of 2800 fps still has over 1,500 foot pound of energy at 1,000 yards. You can push the bullet faster but you'll burn up a barrel or two before you gain the skill to dope the wind at 1,000 yards. A simple 10 mph cross wind will blow the bullet 4 feet to one side. For every foot you miss judge the range you'll be 5/32 of an inch high or low.
A .768 BC in a .338 is the best I can find. There is 240 grain .308 bullet with a BC of .711 (It must be shot in magic air:={) I can't find any loads but I'll bet its slow.
The closest thing I can find in a light rifle to actually doing the job is is a one of the 6.5 mm rifles. You can buy off the shelf ammo good enough for for at least 800 yards. Hornady that has 1,000 foot-pounds at 800 yard for a 6.5 Creedmoor with an A-Max bullet has a over 1,000 foot pounds at 800 yards. Hand loads might get you 1,000 foot pounds at 1,000 yards. I have no idea how much practice it take to make you good enough to dope the wind and conditions and make a sure humane kill at 1,000 yards. If you can put the bullet where it needs to be the rigth 6.5 mm bullet will do the job. For example is Walter Bell by his count he killed 1,011 elephants
W.D.M. Bell and His Elephants with a wide range of rifles mostly a 7x57 Mauser because of the reliable ammo that was available. He also killed a number of elephants with the 6.5 mm swede all with brain shots.
The 6.5 Creedmoor has better ballistics than the 6.5x55 Swede having the same rifling twist rate and it can be loaded to higher pressures and velocities. Bell didn't shoot at long ranges. With 6.5 Creedmoor using 142 mg bullet with BC G1 of .6 and muzzle Velocity of 2750. A 10 mph cross wind blows the bullet 5 foot off line and the bullet will be off vertically 0.27 inch for every foot in error in judging the range. A .338 Lapua has better ballistics but it sure is lot heavier and kicks more than any 6.5mm
There are some 145 and 150 grain 6.5 mm bullets out there I can't find any numbers for them. Unless their round nosed bullets they may not stabilize in a 1:8 twist barrel.
Just a note: Elmer Keith used a 44 or 45 pistol out to 600 yards to down Elk or Deer some one else had shot before they got away in bush. Keith never told how many he missed. But trying to down a wounded anaimal with what ever you have at any range is not the same making the shot that wounds them.
Red