This one I'm trying to launch is 12oz because it fits nicely in 1.5" ABS pipe.

If doing it with power doesn't work or has too many drawbacks, I'll just do compressed air, I'm just having fun, you see.

Plus, it's something to talk about "I hired these guys to come take down a tree and they pulled out a FUCKING CANNON and shot a bag into my tree while screaming AHOY AND AVAST YE NIGGARS!!!!"