I am not an IPone user but found this interesting.

Is your iPhone or iPod Touch a bit too, well, artsy? Not rugged or manly enough for your taste?
Here's the solution: the Bulletflight ballistics calculator, which predicts the trajectory of bullets fired from high-powered sniper rifles by taking into account half a dozen variables including wind speed, distance, outside temperature and altitude.
After digesting all the information, Bulletflight tells you where exactly on the sniper scope you should position your target in order to hit it.

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