Fired off my little Kennesaw Cannon Howizter this week......great fun! Shot off all my blackpowder and have to go buy some more on payday. I highly recommended this little cannons. Found the best best price on them at cannonfuse.com
Since the company is located in Kennesaw, wonder if you can buy them direct? The company also makes inserts that can fire .22lr and 45LC/410 out of a 26.5mm flare pistol.