6.5×53mmR
| 6.5×53mmR (6.5x53.5mmR) | ||||||||||||||||
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Military cartridge | ||||||||||||||||
| Type | Rifle | |||||||||||||||
| Place of origin | Austria-Hungary | |||||||||||||||
| Service history | ||||||||||||||||
| In service | 1893–1945 | |||||||||||||||
| Used by | Kingdom of Romania Netherlands Kingdom of Portugal | |||||||||||||||
| Wars | Aceh War World War I World War II Indonesian National Revolution | |||||||||||||||
| Production history | ||||||||||||||||
| Designer | Steyr Mannlicher, Ferdinand Mannlicher | |||||||||||||||
| Designed | 1892 | |||||||||||||||
| Specifications | ||||||||||||||||
| Case type | Rimmed, bottleneck | |||||||||||||||
| Bullet diameter | 6.65 mm (0.262 in) | |||||||||||||||
| Neck diameter | 7.55 mm (0.297 in) | |||||||||||||||
| Shoulder diameter | 10.75 mm (0.423 in) | |||||||||||||||
| Base diameter | 11.48 mm (0.452 in) | |||||||||||||||
| Rim diameter | 13.4 mm (0.53 in) | |||||||||||||||
| Rim thickness | 1.25 mm (0.049 in) | |||||||||||||||
| Case length | 53.5 mm (2.11 in) | |||||||||||||||
| Overall length | 77.47 mm (3.050 in) | |||||||||||||||
| Rifling twist | 7.874 in (200 mm) | |||||||||||||||
| Primer type | Berdan | |||||||||||||||
| Ballistic performance | ||||||||||||||||
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| Source(s): Rifles and Machine Guns .256 Mannlicher / 6.5x53R Reloading Data | ||||||||||||||||
The 6.5×53mmR, originally and more correctly produced as the 6.5×53.5mmR, and in imperial system nomenclature known as the .256 Mannlicher, is a late 19th-century rimmed centerfire military rifle cartridge similar to other early smokeless powder designs.