This is a 30 M1 Carbine cartridge necked down to .22? It was given to me by my Uncle in 1959 who worked as a game warden for the City of Omaha. The rifle and ammo was confiscated from a deer poacher who illegally took deer out of season and stored a dozen of these animals in his garage until he was caught. Don’t know what happened to the rifle, he just game me the cartridges. Head stamped 30 M1 Carbine.
Off the top of my head, but I think it is called a .22 Johnson Spitfire.