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We used to make giant spud guns, but instead of a solvent, we would inject butane into the chamber until all of the 'air' was driven out, and then some oxygen (experiment until you get the right ratio). The result was a spud gun that would shoot a potato core clear through those barrels that are used as trash cans at parks these days. It would bend the can in two and split through the front and back. The potato would probably travel for at least 600 yards.
Also, we got better results when we put a little sealant about 4 inches past the chamber end of the barrel, it forced the pressure to build up a little more before releasing the potato. Oh, if you put a nail through the barrel about 1/2 inch from the chamber, it prevents the potato from falling into the chamber and makes the loading process a little more uniform.
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"Socialism is a philosophy of failure, the creed of ignorance, and the gospel of envy, its inherent virtue is the equal sharing of misery." - Winston Churchill
"All men dream: but not equally. Those who dream by night in the dusty recesses of their minds wake in the day to find that it was vanity: but the dreamers of the day are dangerous men, for they may act out their dream with open eyes, to make it possible." Seven Pillars of Wisdom, T.E. Lawrence
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