Hello! So my class is doing a projectile launcher project, in which you build a launcher and have to hit a certain target, constantly, each time. I already based mine off an air compressor. It's a copper tube attached to an air compressor. It works perfectly, but the problem is I haven't found an ammo good enough to be fired constantly (i.e: same distance each time). I've tried: 1. A small Teflon ball Advantage: The ball is always placed at the same distance inside the cannon Disadvantage: The air would sometimes go around the ball, which messes up the range each time it is fired 2. Shaved rubber stopper Advantage: The compressed air is concentrated on the stopper, does not go around the stopper, like the ball Disadvantage: The placement of the stopper inside the cannon is not constant. I can't push it all the way to the bottom because it gets stuck. The friction is also so great that it's hard for me to push the stopper in the same position each time. Would a Nerf gun ammo work? It would be greatly appreciated if you could help me out! I'm really stuck on what I should use next! All suggestions and inputs are welcomed. Thanks so much.