All too true, DAC, about the ethics, but also about the enjoyment and challenge of stalking closer, and seeing the game better, and the practicality. No matter about the shooting skills, because beyond 225 yards, you start to having to hold over. Beyond 300 yards, range estimation to within 15 yards becomes vital, and the wind and thermal currents will make for terrible misses by even the best shot. Lastly, the time for a bullet to travel 300 yards is enough for the animal to move just as you let it go, and make the strike a foot behind your aiming point.
Even as little as I get to practice, when I do, I still plink by shooting sticks, checkers, and bottle caps offhand at 100 yards, and can hit a high percentage of them with iron sights. A clay pigeon at 250 yards on a calm day, offhand, is a still a 99% shot for me. I have shot foxes and coyotes with iron sights at 400 yards, and deer and boar at 300 with a scope, when conditions were right and I could sit or lean on a tree. But I would not take a 300 yard shot with wind or any chance of the game taking a step, as is the norm in the mountains. Several of my hunting friends were USMC or Army combat snipers, and are the same way... the fun is in stalking and picking the right ambush point, so every shot is a sure thing. Testing one's shooting skill is for the range.