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My cannon was about 3.5 feet, overall length. The chamber was roughly 4 inches, if memory serves correctly. We got about 200 yards with medium-large potatoes (it was about a 2.5" diameter barrel), and using WD-40 as a propellant.
If I still had it, I would film it for you. Heh, maybe this is a good excuse to build another one.
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