When I was much younger.
Pipe electronic ignition black powder.
Worked decent enough
Me too....
A lot of young crazy guys, myself included, make big firecrackers.
We would take a thick cardboard tube, drill two small holes in it, pass a bare wire through the holes, put some gunpowder in from a bunch of smaller fireworks (tediously breaking them in half and spilling out the gunpowder) bondo both ends and the wire holes, lay out a bunch of wire, hook to the bare wires with alligator clips, then (AND ONLY THEN) go to the other end of the wire and use the battery.
I don’t think I am giving away any state secrets here. It safely produced a satisfying bang bigger than we were accustomed to.