.22 Short cartridge

This .22short cartridge is a smaller version of the .22lr cartridge Various marlin & henry lever action rifles use this cartridge.
With a rimfire cartridge, the ignition charge (impact axis) is pressed into the thin-walled protruding edge of the shell bottom.
Impact of the firing pin at this location ignites the cartridge.
A very small cartridge with little recoil. It belongs to the .22 family