Beschrijving

The 6mm BR 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.

6mm Norma BR

In 1996 Norma of Sweden introduced the 6mm Norma BR which was dimensionally similar to the 6mm BR Remington. However the chamber of the Norma version provided a longer throat making allowances for the seating of very low drag (VLD) bullets. It was designed from the beginning to optimize accuracy, barrel life, and case capacity in a 6 mm cartridge for 300–600 metres (328–656 yd) target shooting. As such it couples a sensible case volume (2.45 ml) to bore area (29.52 mm²/0.2952 cm²) ratio with ample space for loading relatively long slender projectiles that can provide good aerodynamic efficiency and external ballistic performance for the projectile diameter. This is the most common variation of the cartridge used today.

The 6mm Norma BR has become a popular chambering in match rifles used in 300 metres (328 yd) ISSF and CISM and other 300 metres rifle disciplines.