Ok I know how to sight in my AR. What I do not understand is why my friend that is in the army says he was taught that u should zero your rifle at 25 meters because then it will be dead on at 300 meters. The trajectory part of it makes complete since to me but at 25 meters the rifle could be off a fraction of an inch that wouldn't even be noticeable, but at 300 meters it would be several inches off. Is there something that I'm missing here? Posted using Outdoor Hub Campfire Wanna kill these ads? We can help!