I have seen a lot of ballistics calculators on the internet but they always ask what yardage the rifle is sighted in at. Well, I only have a 100 yard range to shoot on. I have a 7mm Rem Mag that's hitting 2.5" high at 100 yards. The bullet is a Nosler Accubond 160 gr boat tail with a BAC of .531. The bullets are traveling at 3050 fps ten foot from muzzle thru my Chrony. My question is, if this bullet is 2.5" high at 100 yards, what will be the zero? Anyone have a calculator that can do that?