I have been using the Shooter App and like it's format. But when I did some "real" drops at, say, 500 yards, it would not let me update/recalculate the velocity and thereby the drops. It keeps telling me the app has stopped, but when I try to restart, nada. So my question is what app (s) are you using? Why do you like it? What I loved about Shooter is it's simplistic way of adding new rifle/ammo. Easy to follow and understand, and if you want to get really nerdy, it has that too. I'm looking for one like Shooter that will easily add the guns, ammo and that you can easily navigate and make changes. Shooter did almost that, til I tried to enter correct drops to recalculate vel./drops. at other distances.