One way to practice deflection shooting is going offline and kill the drones. But fly in a circle *clockwise*, opposite direction of the drones, and with a bit of alt "advantage". If you have trouble hitting them at all, use the Lead Computed Gunsight to give you an idea of where to aim.
Also, do you have a forward view set up? Look forward (KP 8 or hat up) - i have the head set all the way up and to one side, to get a better view over the nose.
The trick for deflection shooting is SA - anticipation. *Know* where the opponent is without seeing him. Estimate his position fro his last vector, angle and speed. Now, this sounds very complicated but it in fact really isnt that much. Its a mix of practice, experience and intuition. Practice it with the drones, they are not exactly know for their erratic maneuvering
- that helps a lot at first.