1. A method of indicating an energy transfer level in an optical sighting system, the optical sighting system having a main optical axis extending from an ocular end to an objective end of the optical sighting system, the main optical axis being fixedly aligned with a bore line of a shooting device, the method comprising:receiving, from an electronic ballistics calculator, a ballistics profile indicating a calculated path of a projectile to be fired from the shooting device toward a target;
receiving, through a mobile application running on a mobile device external to the optical sighting system, a user input indicative of a desired terminal performance value for the projectile;
determining, by the mobile application, a predicted terminal performance value of the projectile based, at least in part, on the ballistics profile;
activating, when the predicted terminal performance value does not exceed the desired terminal performance value, an electronic, non-numeric performance indicator structured to provide a notification signal to a user; and
deactivating the electronic, non-numeric performance indicator when the predicted terminal performance value exceeds the desired terminal performance value.