The benchmark of precision rifle cartridges. The 6 BR is responsible for more benchrest records than any other cartridge.
Type: Rifle
Introduced: 1978, Sweden
Parent case: .308 Winchester
Standardization: SAAMI
Bullet diameter: 0.243" (6.17 mm)
Case length: 1.56" (39.62 mm)
Overall length: 2.22" (56.39 mm)
Max pressure: 60,000 PSI
Rim type: Rimless
Primer: Small Rifle
Typical twist rate: 1:8
Muzzle velocity: 2900–3200 fps
Muzzle energy: 1260–1620 ft-lbs
Effective range: 800 yd
Common bullet weights: 68, 95, 105, 107, 108 gr
Primary use: Competition, Long Range
Production status: Active
Also known as: 6mm BR · 6 BR
History: Developed from the .308/7.62x51mm case necked down, then refined by Norma. The bench rest community adopted it and found it extraordinarily accurate. Parents the 6mm Dasher and influenced 6.5 Creedmoor development.
Notable firearms: Custom benchrest rifles, Barnard action rifles
Similar cartridges: 6.5mm Creedmoor, .243 Winchester