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. This is the most common variation of the cartridge used today. As such it couples a sensible case volume (2.45 ml) to bore area (29.52 mm 2/0.2952 cm 2) ratio with ample space for loading relatively long slender projectiles that can provide good aerodynamic efficiency and external ballistic performance for the projectile diameter. 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. However the chamber of the Norma version provided a longer throat making allowances for the seating of very low drag (VLD) bullets. In 1996 Norma of Sweden introduced the 6mm Norma BR which was dimensionally similar to the 6mm BR Remington. The Remington version of this cartridge is now considered to be obsolete. Remington continues to offer the 6mm BR Remington in the 40-X series rifles. By 1988 Remington was also manufacturing ammunition. In 1978 Remington started manufacturing their Remington 40-X rifle in the 6mm BR and named their version of the cartridge the 6mm Bench Rest Remington. Several 6mm BR variants exist apart from the Remington and Norma versions: the 6mm BRX, 6mm Dasher, 6 mm BRBS 6 mm UBL. Cases required fire forming in the chamber as chambers of the rifles varied from one to another. 24 caliber (6 mm) cartridge version became known as the 6mm Bench Rest or the 6mm BR due to its widespread use in the sport of bench rest shooting.īecause the cartridge was a wildcat and was not standardized until several years later, several variations of the cartridge existed. The new cartridges’ accuracy and efficiency was noticed by the bench rest shooting community. 24 (6 mm) caliber cartridges based on the Barnes’ cartridge. 308×1.5" Barnes cartridge, wildcatters and experimenters began developing their own wildcats based on. There are two basic variants of very similar dimensions, known as the 6mm BR Remington and the 6mm Norma BR. 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. The 6mm BR is a centerfire cartridge created for benchrest shooting. 308 Winchester cartridgesĦ.8 g (105 gr) Lapua GB542 Scenar-L (OTM)
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