Well worth $20
Although the cost of this app is high when compared to other apps, it quickly returns that investment when you consider the ammunition saved at the range trying to find where the #%{* that last round fell.
Buy it, use it, youll love it. This will be the lowest cost / best value item to add into your long range tool box.
Even when you dont have all of the actual values from your rifle, starting with best guesses will still get you a lot closer than a buddy on a spotting scope calling out info.
Death Bubbles about
Ballistic: Advanced Edition, v6.2.0