I ran into a question from a young friend today, basically he was trying to work out the drops from his rifle, and found a great deal more dialing up than would be needed given his expectations. I say expectations as nothing has been verified. The rifle has generally shot well. He has no idea how the scope tracks, and I suggested starting there. Anyway using the G7 Ballistic Calculator at the top of the page to get a bit of an idea how much variation some minor variations in input would amount to. I started playing with scope height and was surprised, it reports very small differences at 600 yards (his current goal). The program indicates with the scope mounted 1.5" high, vs 2" high amounted to a 1" difference. I've never used that portion of the program before, and expected a greater variance. Is it my expectations or my inputs that are out of whack.