This subject is a great one for starting a heated argument. My answer is that if you are attempting such shots on big game animals, you are accepting the fact that you are going to wound and lose a pretty high percentage of the animals you shoot at. Yes, these shots are possible, and yes, a person with the knowledge, training, equipment and experience can do this, MOST OF THE TIME. NOT ALL OF THE TIME.
Adjusting the scope to the proper elevation for the range is the easy part. If you have a laser rangefinder and have your trajectory doped, you will be very close for elevation. That's not the biggest problem.
There is absolutely no way under field conditions to determine EXACTLY what the wind is doing between you and that moose a half mile away. It could be blowing in 6 different directions at 6 different speeds between you and the moose. That can throw your shot off by several FEET at such ranges.
Also, that moose had time enough to take a step forward between the time the trigger was squeezed and the moment the bullet struck. That would put the bullet in his guts even if you did read the wind correctly.
Is a moose just a thing to shoot at, or is it a living, breathing, sentient being, with a strong instinct to live and a capacity for great suffering? And do we owe it any respect when the crosshair settles on its shoulder?
So the questions boils down to this, "are you willing to wound and maim, lose and waste, a certain percentage of the animals you attempt to take? Personally, I want my percentage of success to be 100, all of the time...but I'm not perfect. The farthest I would shoot at that moose would have been about 400 yards, IF everything looked perfect.
I would like to see the videos that show the bad shots...the ones where the moose runs off after the shot. Do our video heroes walk 890 yards and spend half a day looking for him, or do they head on to the next victim?
Am I in favor of outlawing such shots? No, every person should be free to make a moral choice. Do I think it is a wrong moral choice? Yup, that's why I wouldn't do it.