Agree with Stubblejumper on this one. THE ONLY WAY you're gonna know where your bullets impact from your rifle is to shoot at known distances. If you want to know where your bullet hits at 300 yards (or 100 yds), shoot it at those distances (after you get on paper at 25yds). The charts reflect computer generated figures, which may or may not be the same as your rifle/bullet combination. There are other differences as well including barrel length of the "test" gun as opposed to your barrel length. Best bet is to know where your bullet will hit, and the ONLY way to determine that accurately is to shoot your gun.