4.38×30mm Libra

4.38×30mm Libra
Type Personal defence weapon
Place of origin  Czech Republic
Production history
Designer Vlastimil Libra
Designed 2002
Manufacturer Czech Weapons (ČZW)
Parent case .22 Hornet
Case type Rimless, bottlenecked
Bullet diameter 4.28 mm (0.169 in)
Neck diameter 4.90 mm (0.193 in)
Shoulder diameter 6.88 mm (0.271 in)
Base diameter 7.56 mm (0.298 in)
Rim diameter 7.65 mm (0.301 in)
Rim thickness 1.24 mm (0.049 in)
Case length 30.10 mm (1.185 in)
Overall length 41.00 mm (1.614 in)[1]
Maximum pressure 430 MPa (62,000 psi)CIP
Ballistic performance
Bullet mass/type Velocity Energy
45 gr (3 g) Spitzer 2,300 ft/s (700 m/s) 528 ft·lbf (716 J)
Source(s): Small Arms Defense Journal

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.[2]

The cartridge is based on a .22 Hornet cartridge converted to a rimless design and necked down to .17 calibre.[3] The .17 Libra has been standardized by C.I.P. to a pressure of 4300 bar.[1]

See also


  1. 1 2 "17 Libra" (PDF). C.I.P. TDCC. Retrieved 18 July 2013.
  2. http://www.czechweapons.com/en/products/military-weapons/personal-defense-weapon-pdw-czw-438/
  3. ".17 Libra". municion.org. Munición. Retrieved 18 July 2013.

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