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6 mm BR Remington
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6mm BR, 6mm Dasher and .308 Winchester cartridges
Type Rifle
Place of origin22x20px United States
Production history
DesignerWildcats: Various
Commercial: Mike Walker
DesignedWildcats: 1962-1963
Commercial: 1978
Produced1978-present
VariantsSeveral. See article.
Specifications
Parent case308x1.5 Barnes [1]
Case typerimless, bottlenecked
Bullet diameter.243 in (Bad rounding hereScript error mm)
Neck diameter.270 in (Bad rounding hereScript error mm)
Shoulder diameter.458 in (Bad rounding hereScript error mm)
Base diameter.473 in (Bad rounding hereScript error mm)
Case length1.560 in (Bad rounding hereScript error mm)
Primer typesmall rifle
Maximum CUP52,000 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
Neck diameter 0.2710 in (Bad rounding hereScript error mm)
Shoulder diameter 0.4580 in (Bad rounding hereScript error mm)
Base diameter 0.4690 in (Bad rounding hereScript error mm)
Rim diameter 0.4730 in (Bad rounding hereScript error mm)
Case length 1.5600 in (Bad rounding hereScript error mm)
Overall length 2.4400 in (Bad rounding hereScript error mm)

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.[2] There are two basic variants of very similar dimensions, known as the 6mm BR Remington and the 6mm Norma BR.

Cartridge HistoryEdit

Soon after the .308x1.5 Barnes cartridge introduction wildcatters and experimenters began developing their own wildcats based on the cartridge. By 1963 there were a several .22 (5.7 mm) and .24 (6.1 mm) caliber cartridges based on the Barnes’ cartridge. The new cartridges’ accuracy and efficiency was noticed by the bench rest shooting community. The .24 caliber (6.1 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.

Since the cartridge was a wildcat and was not standardized until several years later, several variations of the cartridge existed. Cases required fire forming in the chamber to provide the maximum in accuracy as chambers of the rifles varied from one to another.[3] Several 6mm BR variants exist apart from the Remington and Norma versions: the 6mm BRX,[4] 6mm Dasher,[5] 6 mm BRBS[6] 6 mm UBL.[7]

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.[8] By 1988 Remington was also manufacturing ammunition.[9] Remington continues to offer the 6mm BR Remington in the 40-X series rifles.[10] The Remington version of this cartridge is now considered to be obsolete.[9]

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 VLD bullets.[9] This is the most common variation of the cartridge used today.[11]

The 6mm Norma BR has become a popular chambering in match rifles used in 300 metres (Script error yd) ISSF and CISM and other 300 metres rifle disciplines.[12][13]

DesignEdit

The cartridge is based a necked down .308x1.5 inch Barnes cartridge which in turn is based on the Winchester case shortened to 1.5 inches (Bad rounding hereScript error mm). It is one of the earlier cartridges to follow the short, fat design concept. Short fat cartridges have characteristics that make them more efficient and accurate.[14]

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6mm Norma BREdit

The 6mm Norma BR cartridge introduced by Norma in 1996. It is based on the 6mm BR Remington cartridge, although where Remington's cartridge was intended for bullets of about 70 grains (Bad rounding hereScript error g), Norma standardized their set of chambering specifications for a very low drag (VLD) bullet of over 100 grains (Bad rounding hereScript error g), thus realizing the long-range capabilities of the cartridge. This resulted in a much longer throat in rifles chambered for the Norma cartridge.[15]

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See alsoEdit

ReferencesEdit

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  12. Lapua Sport Shooting cartridges - the 6mm Norma BR
  13. 6mm Norma BR DL match cartridge for 300 m rifle shooting product page
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External linksEdit

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