Dear Fernando and Jim,
You're quite welcome on the quote, and I'm glad to finally see one of those Allen guns.
Jim--I'm not an expert on blackpowder weapons, but logically, I would guess that the source of the multiple ignition problem lies in the back of the revolving barrel. In modern revolvers, the cartridge seals the back of the barrel, so that the explosion is contained in the chamber. In a black powder revolver, if there's any leakage from one chamber to the next (or from one primer hole to the next) you could get the explosion in one chamber setting off the others.
Just a guess.
F
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