8×64mm S
| 8×64mm S | ||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 rimless bottlenecked centerfire cartridge developed as a military service round for the German Army who never issued it. As is customary in European cartridges the 8 denotes the 8 mm bullet caliber and the 64 denotes the 64 mm (2.52 in) case length.
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 Mauser Gewehr 98 bolt-action rifles. In such military M98 bolt actions the magazine boxes, however, have to be adapted by a competent gunsmith to function properly with the 8×64mm S cartridge, since the M98 internal magazine boxes feature an internal magazine length of 84 mm (3.31 in).