While I'd hate to be facing this thing when it let go, it looked like a huge pain to load. The Tredegar Iron Works was an interesting place to visit, BTW.
I'd love to see somebody actually exercise the thing; uncranking the back, loading each of the barrels, buttoning it up. Without special tools it must have taken a whale of a long time. A different version with only 15 barrels is loaded and fired below: