Well - here are a couple of experimental "Cannoneers" having fun and youtubing it so that we can all enjoy it too - all 32 barrels!:
32 Smoking Barrels.
Working under tough conditions - as someone forgot to bring the correct .36" calibre balls - the Guys above stayed with-it and improvised by using .31" calibre balls.
Great effort and Thank You men,
- Here are some others showing what can be done:
I do know of a local kiwi shooter who has a cannon that he demonstrates using projectiles made from aluminium soft drink/beer cans - filled with concrete.. You must admire folk doing these fun things for others to enjoy eh.