How are you feeding balls to your shooter?

[Borobo]

we aren't really using a shooter, more of just a dunker, but we're using a combination of 2 polycord conveyor belts so that one functions as the feed (the bottom one) and the top will both store and quickly launch our 3 balls. Instead of putting one belt on either side of the ball, we will just have one motorized side which pushes the balls against the other, which will have a grippy surface to just roll them up the wall, which, we hope, will save on motors, power consumption, and weight.