Not wishing to question veracity or ethics on this topic, I will however say this. There is a point at which a shot on an animal becomes unethical due to factors way out of the shooters control. All of us practice in an effort to gain skill and confidence in our firearm(s). However physics and the laws of the gravity make shooting at a certain point unethical. Factors such as breath control, cross-currents, air density and a hundred other factors come into play.
Unless you can figure out a load that changes the laws of the physical universe I' d say we ought to be far more careful than some of us may be.
We spend countless hours reading ballistics charts to better understand trajectory and a bullets retained energy, knowing that it is bullet performance that counts. There comes a point, no matter how much gun you have or how skilled we are where retained energy and bullet performance is just not certain.
I say that some of the distances mentioned in these posts, if true, are shots that should never have been attempted. A simple respect for the animal we hunt should count for something.