I wonder what wadding they used above the shot in the rear load?
"Tight"
Jon;
I think the idea was the back locks would be fired with the front hammer down on a fired cap. This should prevent most of the blow back & what there was would be diverted upward by the shield. From what I have read on these in the past the major reason these did not catch on well was the internal Blow Back igniting the rear charge, not from any external problem. From this aspect though a shotgun would likely give a better seal than would a "Musket Ball".
