I just bought shooter app for my phone and can't figure out what I did wrong. I have a proven chart for a few of my riflrs but this app is way off. For example I know my 308 needs 21 moa at 850 yards. The new app says I only need 11moa. Same rifle at 1100 yards needs 43moa and shooter says dial 19moa. Any suggestions would be appreciated. I did get the drop chart close but I had to take my velocity from 2950 down to 2200.