Ho the fire,
I saw one in use at "Hang Um' High" at Oconomowoc. After several clips full, it jammed. Don't know if the jam was due to fouling. It would still run on Five barrrels and did for a while before jamming again. It would have stopped a charging hoard of indigenous barbarians armed with pointed sticks.
The thing was around 74 Caliber, used it's own cartridge cases and readily cut off foot thick telephone poles, blew up barrels of water and shattered the backdrop. It was more of a rotary canon.
DD-DLoS