[MrBasse]

We built one similar a few years back and having shells preloaded is great for speed or for targeting sponsors (if we see on in the crowd at a football game we can load three in a row that contain their shirts).

We run ours off of CO2, and only at 12 psi for normal operation. We use one $14 tank for around 70-80 shirts.

I'll put up a picture soon, the only part we haven't figured out yet is the magazine. I like your solutionwith the rotart loading. We simplified a bit and used a pneumatic ejector and plan to spring load shells so they autoload when the spent shell is ejected.