That’s all way too complicated. Know your rifle and keep it clean. Know your ammo and don’t screw with it. Understand “Kentucky windage” and use it and you will hit that bucket or at least scare the hell out of it every shot. All that bookwork is a substitute for not growing up with a rifle in your hand-—carry on-—Semper Fi.
Rex knows his stuff and all that bookwork is what makes him an expert in the field of Long Range Shooting. If you lean back and watch the videos, you will gather up a lot of information that will make you a much better shot than you are today.