What are the lengths of the chamber and barrel? What sort of range are you getting, and with what size potatoes? We need more details, and, if possible, video clips.
I'll try to get a few clips of mine up, it's a sinister contraption made entirely of iron pipes forged in the depths of hell (my basement) that shoots large (1") gumballs hundreds of yars into the night.
Also, if you let the potatoes dry out a bit and spray them with your fuel of choice, they'll fly out, engulfed in flames.
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