When I was a kid I got the empty soda gas cylinders for making soda water . Think I still have that old soda bomb thing somewhere. The cylinder is a neat fit in a 12 gge shell. I drilled the neck out and filled it with black powder, put in a piece of blasting fuse , sealed it with wax and stuck it in a 12gg shell.with no shot or wad and a pinch of black.
Fired it off . sometimes it went bang up in the air like a birdfrite sometimes not.
Things we did as kid. Of course not to be recommended nows