Yes, it was a 28 guage Eley brand. You can use a shotgun shell but you have to remove the pellets of course. Top up the remaining area with blackpowder. The guys I bought mine from (K&M) said they would use teabags full of blackpowder around the fins to give it extra charge but I have never done this.
I actually have always gone with the proper ballistite cartridge. If you check at the gunshows with the cartridge collectors, especially the shotgun shell collectors, they occasionally have them.
One book I had on ordnance said that the ballistite was comprised of 65% nitro, but I really don't know much on these things. I can tell you that ear defenders wouldn't be overdoing it when you do fire it. Much louder than you would expect.
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