I see. I'm don't remember if it got banged around. I'll build another one just to be on the safe side. I wonder if it would be worth getting the next gun's chamber and barrel sprayed with line-X. They have some stuff that can keep a wall standing after an explosion. I might be getting a job at a mac...

I built a cannon a few years ago. The chamber is 4" sch40 PVC from McMaster. It's been sitting in my garage at my apartment for the last 2 years. Should I be worried about the PVC becoming brittle? It's been exposed to temps over 100* and below 0* in the garage (Indiana weather). No direct sunlight.

actually 3x48 has a volume of 340cu inches 6x24 has a volume of 680 cu inches volume of cylinder = pi * radius^2 * length pi = 3.14 for those w/o the special button 3"x96" = 6"x24" last i checked the PSI on 6" sch 40 was only 80, i'd stay w/ 4" or get a metal casing for the chamber in case of catast...