4.38×30mm Libra: Difference between revisions
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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 |
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* ''.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 |
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* ''.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}} |
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== Cartridge dimensions == |
== Cartridge dimensions == |
Revision as of 23:17, 12 August 2022
The topic of this article may not meet Wikipedia's general notability guideline. (June 2022) |
4.38×30mm Libra | ||||||||
---|---|---|---|---|---|---|---|---|
Type | Personal defence weapon Pistol | |||||||
Place of origin | Czech Republic | |||||||
Production history | ||||||||
Designer | Vlastimil Libra | |||||||
Designed | 2002 | |||||||
Manufacturer | Czech Weapons (ČZW) | |||||||
Specifications | ||||||||
Parent case | .22 Hornet | |||||||
Case type | Rimless, bottlenecked | |||||||
Bullet diameter | 4.40 mm (0.173 in) | |||||||
Land 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)[1] | |||||||
Ballistic performance | ||||||||
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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
- ^ a b c "17 Libra" (PDF). C.I.P. TDCC. Archived from the original (PDF) on 18 November 2020. Retrieved 18 July 2013.
- ^ Czech Weapons Product Page http://www.czechweapons.com/en/czw-438/
- ^ ".17 Libra". municion.org. Munición. Retrieved 18 July 2013.