I know nothing about guns, but I am willing to learn. I want to purchase a gun for long distance shooting, but I want to be able to carry the gun for lengths without tiring or without it being a hassle. I was watching Top Shot and they featured the LaRue Tactical OBR. That would be perfect, but I don't think it has the range I am looking for. I want to be able to hit targets at 400-500 yards accurately. Is there a gun that allow for such a shot? Or is the LaRue Tactical OBR capable of such a shot?