For those new to dialing a doping like me. And are looking for an App. Go to your app store and pic this up. I have been wanting something easy to use and reliable to use, mind you 350 yards is not a long shot by any means, it was as far as I could get where I was. The bullet was a factory loaded federal 80g soft point. The rifle is a box stock vanguard .243 with an old red field range finder wide field. The scope only has a finger turret for elv. So I have to hold off for wind. I was shooting off a harris by-pod with my fist balled up under the butt. The first shot struck 3 o'clock, I was holding center of the can and about 3/4s up from the base. I was able to see the hole so I held on the left edge of the can. The next shot hit the 1 o'clock area. Guessing by how much I missed by, the wind was about 5mph right to left.. I am sold on this app. If it gave my that kind of result from what I had, with a little practice and a scope I can dope with the next round will probly strike.