About a year ago I bought a Sig scope with a free ballistic turret made to the bullets and caliber that you shoot. After a year I had it installed. I hope they did not change the zero of the rifle. Going to give it a try on Friday. I have never used one before. The dial is different than the stock dial. When rotating up, the first numbers on the dial is 1.5. With a 100 yard zero, what would the 1.5 represent?