Min 20 per hour. Need a consultant. I would like to develop and design an app that deals with internal and external ballistics. More on the thinking of using smartphone sensors to break down the trajectory in a different technique than what is being used with ballistic engines what are used by the apps that are available currently. This data would be the precursor to the more refined methods of accuracy and precision. If you know of someone that understands rifle shooting and app development let them know. We can make a great contribution to the field.