New to the forum and so while I'm waiting for replies to my first post I came across this thread. Was in a gun shop yesterday and the owner had 2 working scale model cannons that had only a 1" bore with 18" spoke wheels and it was very very heavy, but cool! Anyway, point being that I've been building 50 caliber, civil war type, breach loading, cannons out of water pipe and scraps the past couple of weeks and that's enough fun for me and the grandkids. We use 1.5 grain firecrackers and that will shoot a 1" wooden "shell" about 30 yards. We've got 6 working models so far and counting. Fun fun!
BTW, any ideas on making a scale exploding "shell"? Which is why I was in the gun shop in the first place.