8×64mm S
This article includes a list of general references, but it lacks sufficient corresponding inline citations. (September 2014) |
8×64mm S | ||||||||||||||||||||
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Type | Rifle | |||||||||||||||||||
Place of origin | German Empire | |||||||||||||||||||
Service history | ||||||||||||||||||||
In service | Never issued | |||||||||||||||||||
Production history | ||||||||||||||||||||
Designer | Wilhelm Brenneke | |||||||||||||||||||
Designed | 1912 | |||||||||||||||||||
Produced | 1912 - present | |||||||||||||||||||
Variants | 8×65mmRS (rimmed) | |||||||||||||||||||
Specifications | ||||||||||||||||||||
Parent case | none | |||||||||||||||||||
Case type | Rimless, bottleneck | |||||||||||||||||||
Bullet diameter | 8.22 mm (0.324 in) | |||||||||||||||||||
Neck diameter | 8.96 mm (0.353 in) | |||||||||||||||||||
Shoulder diameter | 10.85 mm (0.427 in) | |||||||||||||||||||
Base diameter | 11.95 mm (0.470 in) | |||||||||||||||||||
Rim diameter | 12.00 mm (0.472 in) | |||||||||||||||||||
Rim thickness | 1.30 mm (0.051 in) | |||||||||||||||||||
Case length | 64.00 mm (2.520 in) | |||||||||||||||||||
Overall length | 87.50 mm (3.445 in) | |||||||||||||||||||
Case capacity | 4.51 cm3 (69.6 gr H2O) | |||||||||||||||||||
Rifling twist | 240 mm (1-9.449") | |||||||||||||||||||
Primer type | Large rifle | |||||||||||||||||||
Maximum pressure (C.I.P.) | 405.00 MPa (58,740 psi) | |||||||||||||||||||
Ballistic performance | ||||||||||||||||||||
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Test barrel length: 600 mm (23.62 in) |
The 8×64mm S (also unofficially known as the 8×64mm S Brenneke) (the S means it is intended for 8.2 mm (.323 in) groove diameter bullets) is a
The 8×64mm is a hunting cartridge in central Europe and can due to its 87.5 mm (3.445 in) maximal overall length fairly easily be chambered in standard sized military
History
At the start of the 20th century the famous German gun and ammunition designer Wilhelm Brenneke (1865–1951) was experimenting with the engineering concept of lengthening and other dimensional changes regarding standard cartridge cases like the M/88 cartridge case, then used by the German military in their Mauser 98 rifles, to obtain extra muzzle velocity.
In 1912 Brenneke designed the 8×64mm S cartridge de novo (the 8×64mm S has no other cartridge as parent case). This cartridge is an example of a de novo rifle cartridge (the 8×64mm S and 6.5×64mm have no other cartridge as parent case) intended as a ballistic upgrade option for the Mauser
Commercially the 8×64mm S was after an initial success phase in the period between the
The 8×64mm S offered compared to the
Beside the 8×64mm S rifle cartridge Brenneke also designed a rimmed version for break action rifles of the cartridge. The rimmed 8×65mmR S variant of the cartridge was also rather commercially unsuccessful.
The gun designer Otakar Galaš originally developed a sniper rifle based on a Mauser M98 action chambered in 8×64mm S around 1950. It was tested under the ZG 47 designation.[1][circular reference] The rifle was redesigned by Galaš based on a Mosin Nagant action and chambered in 7.62×54mmR. In its final form, Galaš’ rifle was adopted in 1954 by Czechoslovakia, and produced from 1956 until 1958 as the vz.54.
8×64mm
This cartridge also exists in an 8×64mm variant (without the S or any other further additions) intended for a different bullet diameter. Rifles chambered for the 8×64mm sport the earlier tighter 8.07 mm (.318 in) I-bore as found in the 8×57mm I.
To avoid potentially serious accidents, it is important to distinguish clearly between cartridges loaded for these two different bullet diameters, and only fire them in appropriately chambered/barrelled rifles.
Rimmed variants
In 1914 Brenneke introduced rimmed variants for break action rifles of the 8×64mm S and 8×64mm rimless variants. These rimmed variants are known as the 8×65mmRS and 8×65mmR.
Cartridge dimensions
The 8×64mm S has 4.51
8×64mm S maximum C.I.P. cartridge dimensions. All sizes in millimeters (mm).
Americans would define the shoulder angle at alpha/2 ≈ 14 degrees. The common
According to the official
The American
Contemporary use
The 8×64mm S is offered as a chambering option in some European hunting rifle manufacturers' product palettes. The 8×64mm S performance lies between the commercially important
8 mm cartridges compared
Maximum muzzle velocity comparison in % of the probably most proliferated European and American 8 mm rifle cartridges out of 650 mm (25.59 in) long barrels loaded with relatively light to heavy 8 mm bullets to their
Bullet weight gram (grain) | 8.23 g (127 gr) | 9.72 g (150 gr) | 11.34 g (175 gr) | 12.96 g (200 gr) | 14.26 g (220 gr) | Case capacity (%) |
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8×57mm IS | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
8×64mm S | 102.7 | 102.7 | 102.8 | 102.9 | 102.9 | 110.3 |
.325 WSM | 108.7 | 109.1 | 109.0 | 109.3 | 111.1 | 131.7 |
8×68mm S | 108.4 | 108.5 | 108.7 | 110.5 | 112.3 | 136.5 |
8 mm Rem. Mag. | 111.9 | 112.3 | 114.5 | 115.3 | 116.0 | 157.1 |
This comparison is not totally objective since the 8mm Remington Magnum operates at 460 MPa (66717 psi), the .325 Winchester Short Magnum at 435 MPa (63,091 psi), the 8×68mm S at 440 MPa (63817 psi), the 8×64mm S at 405 MPa (58740 psi) and the 7.92×57mm Mauser at 390 MPa (56564 psi) maximum chamber piezo pressure. Higher chamber pressure results in higher muzzle velocities.
See also
References
- Die Patrone 8x64mm S Brenneke erobert sich wieder ihre Nische, DWJ (Deutsches Waffen Journal) 11/2002
- Ende eines Dornröschenschlafs, Pirsch 22/2007
- C.I.P. CD-ROM edition 2003
- C.I.P. decisions, texts and tables (free current C.I.P. CD-ROM version download (ZIP and RAR format))