Re: Civil War Pinfire "Chimney Adapter"
That is a new one on me! I have never seen anything like it and suspect there was very limited production and/or use. I am a bit surprised that it fits an unaltered gun, as the nipple looks too big, even with the lower part narrowed down.
My first thought was that the cartridge was lathe turned, but a closer look at the pictures seems to indicate the metal was rolled and soldered. I can't tell how the nipple is held in or how the base was put in/on, though. The markings on the base could be from the die used to form the case.
It is certainly an ingenious device and could be made today to allow those old revolvers to be fired. Making them out of brass could solve the obturation problem deadin mentions.
I have no idea what the bullet is made from. Could the black be some kind of paint put on by a collector to protect the lead from corrosion?