Excellent point-

I meant to ask if he knew of a -particular- incestuous union...

The reason I ask is that I have a very, very nicely made twenty bore SxS breech loading shotgun, what seems to be an externally capping cartridge gun (hammers over the top of the chambers) that has action cuts of the very same style. The gun I speak of is likely from the 1820's and bears no maker's name.

Perhaps I'll have to get some photos up some time soon.

--Tinker