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* ''.17 Libra [4.38×30mm]'': A rimless varmint-hunting and sport-shooting cartridge
* ''.17 Libra [4.38×30mm]'': A rimless varmint-hunting and sport-shooting cartridge
* ''.17 Rimmed Libra [4.38×30mmR]'': A rimmed varmint-hunting and sport-shooting cartridge for use with break-open actions
* ''.17 Rimmed Libra [4.38×30mmR]'': A rimmed varmint-hunting and sport-shooting cartridge for use with break-open actions
* ''.17 Libra Magnum [unknown]'': A longer, more powerful rimless round for use in pistols or personal defense weapons{{citation needed}}
* ''.17 Libra Magnum [unknown]'': A longer, more powerful rimless round for use in pistols or personal defense weapons{{citation needed|date=August 2022}}


== Cartridge dimensions ==
== Cartridge dimensions ==

Revision as of 23:17, 12 August 2022

4.38×30mm Libra
TypePersonal defence weapon
Pistol
Place of originCzech Republic
Production history
DesignerVlastimil Libra
Designed2002
ManufacturerCzech Weapons (ČZW)
Specifications
Parent case.22 Hornet
Case typeRimless, bottlenecked
Bullet diameter4.40 mm (0.173 in)
Land diameter4.28 mm (0.169 in)
Neck diameter4.90 mm (0.193 in)
Shoulder diameter6.88 mm (0.271 in)
Base diameter7.56 mm (0.298 in)
Rim diameter7.65 mm (0.301 in)
Rim thickness1.24 mm (0.049 in)
Case length30.10 mm (1.185 in)
Overall length41.00 mm (1.614 in)[1]
Maximum pressure430 MPa (62,000 psi)[1]
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.

Description

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.[3]

Variants

  • .17 Libra [4.38×30mm]: A rimless varmint-hunting and sport-shooting cartridge
  • .17 Rimmed Libra [4.38×30mmR]: A rimmed varmint-hunting and sport-shooting cartridge for use with break-open actions
  • .17 Libra Magnum [unknown]: A longer, more powerful rimless round for use in pistols or personal defense weapons[citation needed]

Cartridge dimensions

The 4.28×30mm Libra has 0.73 mL (11.5 grain H
2O) cartridge case capacity. The cartridge headspaces on the neck of the case.

Americans define the shoulder angle at alpha/2 ≈ 17.04 degrees. The common rifling twist rate for this cartridge is 229 mm (1 in 9.02 in), six grooves, ø lands = 4.27 mm, ø grooves = 4.40 mm, land width = 1.57 mm and the primer type is small rifle.[1]

According to the C.I.P. rulings, the 4.38×30mm Libra cartridge case can handle up to 430.0 MPa (62,370 psi) Pmax piezo pressure. In C.I.P.-regulated countries every pistol cartridge combination has to be proofed at 125% of this maximum C.I.P. pressure to certify for sale to consumers. This means that 4.38×30mm Libra chambered arms in C.I.P.-regulated countries are currently (2020) proof tested at 537.5 MPa (77,960 psi) PE piezo pressure.

See also

References

  1. ^ a b c "17 Libra" (PDF). C.I.P. TDCC. Archived from the original (PDF) on 18 November 2020. Retrieved 18 July 2013.
  2. ^ Czech Weapons Product Page http://www.czechweapons.com/en/czw-438/
  3. ^ ".17 Libra". municion.org. Munición. Retrieved 18 July 2013.


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