Precision shooting requires precise ballistic data that corrects not only for distance but also for wind and other atmospheric influences on the bullet path. GeoBallistics developed an app for iOS and Android devices that uses the JBM Ballistics engine to offer what they claim is the most powerful free ballistics calculator currently available. A $15 upgrade allows you to store multiple rifle cards as well as access a very cool map mode that looks especially useful for hunters.
The WeatherFlow weather station provides real time atmospherics for $85, pairing with the BallisticsARC app via Bluetooth. Combined, this system offers all of the power of the most popular combination weather meter/ballistics calculators at a small fraction of the price.
To download the free app for your iOS or Android device or to purchase the weather station shown in this video, visit: https://geoballistics.com/
PRIME ammo used in this video is available here: http://www.primeammo.com/shop?cmid=LzJXTk5wSGlCcW89&afid=clk3WUx3V3Y2ZU09&ats=K3E3empXNEpNS289