The 4.38×30mm Libra (.17 Libra) is a centerfire cartridge designed for use in personal defense weapons.
It was designed and has been manufactured by ČZW for use in their ČZW-438 PDW.
[2] The cartridge is based on a .22 Hornet cartridge converted to a rimless design and necked down to .17 calibre.
This ammunition-related article is a stub.
You can help Wikipedia by expanding it.