I came across these two items recently and would like any info about them.
This forum will only let me post one picture so the other item is a heavy brass adapter that allows this cartridge to be fired from a 20 gauge shotgun. At least that is what I think it is for. I believe this cartridge is loaded with shot pellets. It has a hard cardboard wad on the open end that is held in by a roll crimp of the brass case rim.