800 yards is too far for any cartridge. Even if you can hit a 9" pie plate, every time, at that distance, no cartridge has sufficient energy for a clean kill.
A 180 grain Remington Hypersonic .300 Mag, sighted in at 250, drops 33.4" with 1644 ft/lbs. on energy at 500. A 160 grain 7mm Mag drops 41.6" with 1371 ft/lbs. at 500. At 800, energy will be far less and the drop far more.
It's highly unlikely any guide would allow you to take a shot that far away anyway. B&C sheep or not. You see one or the whiteish blotch of something that far away, you stalk.
There are several common .30 cal cartridges that have the same amount of energy at 800 yards than a .30-30 has at 100, some even have more at 800 than the old .30-30 has at the muzzle. Is a .30-30 not a capable deer cartridge within 100 yards?
E.G. a 300 RUM with a Nosler 210 grain LRAB still is going 2107 fps with 2071 lb-ft of energy at 800 yards. That is a bit more than the typical 170 grain .30-30 load at the muzzle. Even a handloaded .300 WM can have more energy than a .30-30 at the muzzle.
It is certainly possible to ethically take game at 800 yards with the proper equipment, skill and conditions. I just don't think the OP has a appreciation of just how much it takes. Obviously hailing out long bombs you're not sure of is unethical.
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