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A buddy and I made a black powder cannon out of a brass piston. We capped the end with a nickel, and fed firework fuses in through the fluid hole. Cut a matching groove halfway through two pieces of 4x4 post and set the thing down inside so the barrel poked out of the front of what looked like a wooden cube.
We drilled a short way into a 2x4 with a 1" spade bit, melted fishing weights in a seperate contained and poured the lead into the mold, to make big fat lead projectiles.
The thing would cut through 3/4" ply like warm buter. we had to brace it against an old dry car battry to keep it on the ground when we fired it.
Dont try this at home.
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