Simply the best option!

This is simply the best ballistic calculator for the iPhone. It actually is as good as the best apps for a desktop computer, and considerably cheaper. Also, author support is terrific. I had a problem with my iPhones location services, and the author got right back to me and showed me where (in Preferences) to get it reset so that the app would read it. (the problem was with my phone and not his app).
This is an A+ app.

JeWT about Ballistic: Standard Edition