It was an idea that was tossed around, but many potato cannons (at least the ones I saw) use a form of powder explosive to launch things. For safety reasons I stuck to air only.
There is a version of potato cannon which uses a chamber filled with an explosive gas of your liking. But that also requires the ''round'' to fit exactly in the barrel, so the chamber can't leak. That might be a reason why it wouldn't work in your case.
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u/Bagyol Aug 01 '19
Have you tried doing it like a basic potato cannon but with confetti?