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6.5-284 Norma

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The 6.5-284 Norma (6.5x55mmRB Norma) originated as a wildcat cartridge based on the .284 Winchester cartridge necked down to 6.5 mm.

6.5-284 Norma
.308 Winchester on the left, 6.5-284 Norma on the right
TypeRifle
Place of originSweden
Production history
DesignerNorma
Designed1999
Specifications
Parent case.284 Winchester
Case typerebated rim, straight walled bottleneck
Bullet diameter.264 in (6.7 mm)
Neck diameter.297 in (7.5 mm)
Shoulder diameter.475 in (12.1 mm)
Base diameter.501 in (12.7 mm)
Rim diameter.473 in (12.0 mm)
Rim thickness.054 in (1.4 mm)
Case length2.170 in (55.1 mm)
Overall length3.228 in (82.0 mm)
Case capacity68.33 gr H2O (4.428 cm3)
Ballistic performance
Bullet mass/type Velocity Energy
125 gr (8 g) Partition 3,000 ft/s (910 m/s) 2,497 ft⋅lbf (3,385 J)
142 gr (9 g) Hodgdon 2,850 ft/s (870 m/s) 2,557 ft⋅lbf (3,467 J)
Test barrel length: 24
Source: ,[1][2][3]

History

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The parent case .284 Winchester was created around 1963, but did not see extensive commercial use. The 6.5 caliber allowed for the use of long, aerodynamic bullets. In 1999, Norma submitted it to CIP. It has since been standardized as the 6.5mm-284 Norma.

Use

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The 6.5-284 has been used extensively in benchrest competitions and is known as an extremely accurate long range round. Using an improved version of the 6.5-284, Rich DeSimone set a 1,000-yard (914.4 m) world record with a 1.564-inch (39.73 mm) group.[4] Rich DeSimone's 1,000-yard (914.4 m) record has been broken by Tom Sarver, who shot a 1.403-inch (35.64 mm) group in 2007 using a .300 Hulk wildcat cartridge that is based on the .338 Lapua Magnum cartridge.[5] A 140 gr (9.1 g) bullet in this caliber is typically fired at 3,000 ft/s (914 m/s) to 3,100 ft/s (945 m/s).[6]

See also

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References

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