This is a system I haven't seen before. If I were to hazard a guess, I would say it was a proprietary single shot rook rifle cartridge. From a time when they were still figuring out what a metallic cartridge should look like. The case measures .330" OD and is 1.25" long. Has a round nose bullet (not a round ball) of about .30 cal. There are no markings anywhere on them. Can anyone here shed some light on what these may be?