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I am using cannon grade black powder, not exactly sure what the difference is. The bottom of the cannon is made of a solid piece of steel. I bored a 2" hole 2.5" deep, I drop the powder into this chamber so the ball does not touch it. I also have a tool I made that holds the ball using the thumb...

Saw a bowling ball canyon at the local gun store, only $1500. I thought that looks pretty easy to make. Did some research and found out I would need a 300cf gas cylinder, that was $300 + so I decided to drop the idea. I was on the phone with my gas supplier and asked about a cylinder and he gave...

Very nice job. I built one very similar a few years back with a 5 horse motor. I finally gave up riding it because with a solid read axle you have to be on 3 wheels to turn around and it became clear that there was a painful crash in my future. Look forward to seeing more pictures. Louis