When you say the Pedersoli, are you refering to the "Mortimer" shotgun with a flintlock ignition? If so, that is called a "fowler" not a shotgun. BP shotguns use percussion ignition, fowlers are smooth bore guns that use a flintlock.
I have the Pedersoli fowler, it comes in a 12 gauge only I believe. Overall it is an excellent gun. My only complaint is that I broke the ramrod during its second trip down the barrel. But that was my fault, I was using the wrong over powder wad.
If you are looking for a shotgun, Cabelas has one:
http://www.cabelas.com/cabelas/en/templates/links/link.jsp?id=0006386210061a&type=product&cm Cat=SEARCHFEAT_all&returnPage=search-results1.jsp&Ntk=Products&QueryText=shotgu n&sort=all&_D%3AhasJS=+&N=0&Nty=1& amp;hasJS=true&_DARGS=%2Fcabelas%2Fen%2Fcommon %2Fsearch%2Fsearch-box.jsp.form23&_dyncharset=ISO-8859-1
If you are looking for a fowler, the only one that I know of that is readily availableis the Pedersoli.
~Robert