The Winchester iPhone Ballistics Calculator was designed to be used at the range or in the field. Once the app has been installed on an iPhone, iPod or iPad, cell phone service or internet service is not required. Winchester customers will have full access to all of the features and …

Hornady’s website offers a ballistics calculator as well as down-loadable ballistic chart and their H.I.T.S. calculator to help shooters pick a specific cartridge/bullet for any situation.
It’s free and easy!
Ballistics Calculator
H.I.T.S. Calculator
Down-loadable Ballistics Chart

**Update 2018 ** It seems that most of the GunSim tools are no longer available and many of the links in this post are broken**
GunSim is a great free online tool that will help you understand the effects wind, range, and elevation have on bullet flight and impact. The publisher …