There were many Black powder hammerless guns made.
: There even was a totally enclosed ie: hammerless and cockless, flint-lock double made prior to 1800.
: I wonder if we're missing something here. One barel is marked for the 16 bore 2" shell, while the author of this thread says the other is marked 16 x 11mm. Would mean it is the 16 bore 2" brass shell necked to 11mm? It certainly would be an odd duck and most certainly a black powder round - perhaps one of a kind. The case base dimension would be in the .680" to .690" range.