I found these 12 gauge cases in a box of stuff that was given to me with other ammo. One is steel and and says on the bottom “black powder” and “C.A.I”. The other is brass and has a threaded removable base and has a name I can’t read and a patent date of Nov 29 1864.
Looking for any kind of information about who made them and the exact purpose. There were also some large caliber steel such as 8 gauge and 10 gauge but I only showed two here.
Thanks in advance,