Steel cannons take a few shots to warm up. The first few will just pop a little or fizzle some. Once the barrel gets warmed up, look out, you have 12ga. shotgun blasts! Whatever you use for propellant, read the contents. Any hairspray that contains water, and most do, will not be good. You want one with no water. The main ingredients are butane, propane, alcohol, and so on. I can't remember the brand I used to use, but it was the best! A little starter fluid will help excite things a bit, too. Couple all of that with an M80 in the chamber and you're gonna' make some real noise! I haven't fired mine in several years because I live in the city limits now. Someday I'm gonna' take it up in the hills and launch some spuds.

I'll take some pics in a day or two when this rain lets up so I can get some decent images for you guys.