I was told this could,nt be done...so I made a wooden cannon..that actually works,...well, i cheated a little....I started out with a 4in square x 2foot piece of seasoned oak...I turned it on my lathe, then drilled a 25mm hole down the centre...to within 2in of the end...I then inserted a 22mm copper pipe,that had a stop end soldered on the end...this pipe was smeared with 4min epoxy glue,..once it had set, i drilled a 4mm touch hole,..then i made the gun carriage out of Teak...once it was finished I applied a coat of black paint to the barrel,...the carriage will get Danish oil,....Then I visited a friend...who had some un-used fireworks...we opened them..and used the powder for the propellant....and it worked.....Kaboom!!...will try and get pics next time of the actual firing.....