6mm BR
| 6mm BR Remington | |
|---|---|
6mm BR, 6mm Dasher and .308 Winchester cartridges | |
| Type | Rifle |
| Place of origin | United States |
| Production history | |
| Designer | Wildcats: Various Commercial: Mike Walker |
| Designed | Wildcats: 1962-1963 Commercial: 1978 |
| Produced | 1978–present |
| Variants | Several. See article. |
| Specifications | |
| Parent case | .308 Winchester |
| Case type | Rimless, Bottleneck |
| Bullet diameter | .243 in (6.2 mm) |
| Neck diameter | .270 in (6.9 mm) |
| Shoulder diameter | .458 in (11.6 mm) |
| Base diameter | .473 in (12.0 mm) |
| Case length | 1.560 in (39.6 mm) |
| Primer type | small rifle |
| Maximum CUP | 52,000 CUP |
| 6mm Norma BR | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Type | Rifle | |||||||||||||||
| Place of origin | Sweden | |||||||||||||||
| Production history | ||||||||||||||||
| Manufacturer | Norma | |||||||||||||||
| Produced | 1996 | |||||||||||||||
| Specifications | ||||||||||||||||
| Parent case | 6mm BR Remington | |||||||||||||||
| Case type | Semi-rimmed, Bottleneck | |||||||||||||||
| Bullet diameter | 0.243 in (6.2 mm) | |||||||||||||||
| Land diameter | 0.236 in (6.0 mm) | |||||||||||||||
| Neck diameter | 0.271 in (6.9 mm) | |||||||||||||||
| Shoulder diameter | 0.458 in (11.6 mm) | |||||||||||||||
| Base diameter | 0.469 in (11.9 mm) | |||||||||||||||
| Rim diameter | 0.473 in (12.0 mm) | |||||||||||||||
| Rim thickness | 0.054 in (1.4 mm) | |||||||||||||||
| Case length | 1.560 in (39.6 mm) | |||||||||||||||
| Overall length | 2.440 in (62.0 mm) | |||||||||||||||
| Case capacity | 38-39.5 gr (2.45-2.55 ml) | |||||||||||||||
| Ballistic performance | ||||||||||||||||
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| Test barrel length: 670mm Source(s): | ||||||||||||||||
The 6mm BR / 6.2x39mm is a centerfire cartridge created for benchrest shooting. The cartridge is also known as the 6mm Bench Rest or simply 6 BR, and has also developed a following among varmint hunters because of its efficiency. There are two basic variants of very similar dimensions, known as the 6mm BR Remington and the 6mm Norma BR.