I think he has a very good handle on what he is doing. While the ability to do that is extraordinary, 20" is much larger than the vital area of a deer. Also, unless the gong is being placed in a different scenario for every shot, this is a much different situation than shooting in the same area at the same gong, as the terrain effects on wind and the wind speed indicators will be different at other locations. Once you get a feel for a particular place, it becomes much easier to hit targets in tricky conditions. I'm pretty sure, based on your posts, you know this already. I just don't want someone else to read it and think because they can go to their local range and hit the 1000 yard gong consistently that they're ready for shots on game in mountains or varied terrain at 1000 yards.