| 6.5-284 Norma | ||||||||||||
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.308 Winchester on the left, 6.5-284 Norma on the right
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| Type | Rifle | |||||||||||
| Place of origin | Sweden | |||||||||||
| Production history | ||||||||||||
| Designer | Norma | |||||||||||
| Designed | 1999 | |||||||||||
| Specifications | ||||||||||||
| Parent case | .284 Winchester | |||||||||||
| Case type | rebated 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 length | 2.170 in (55.1 mm) | |||||||||||
| Overall length | 3.228 in (82.0 mm) | |||||||||||
| Case capacity | 68.33 gr H2O (4.428 cm3) | |||||||||||
| Ballistic performance | ||||||||||||
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| Test barrel length: 24 Source(s): ,[1][2][3] | ||||||||||||
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.
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.
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]
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Rebated rim (RB) cartridges
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| Pistol / carbine / PDW | .41 AE • .429 DE • .440 Cor-Bon • .475 Wildey Magnum • .50 AE • .50 GI • FN 5.7x28mm • HK 4.6×30mm |
| Rifle (intermediate & fully powered) | .276 Enfield • .284 Winchester • .30 Remington AR • .350 Legend • .375 SOCOM • .375 Swiss P • .400 Legend • .416 Hushpuppy • .425 Westley Richards • .45 Raptor • .450 Bushmaster • .458 HAM'R • .458 SOCOM • .45-70 Auto • .499 Leitner-Wise • .50 Beowulf • .50 Krater • .500 Jeffery • .502 Thunder Sabre • .505/.404 Stewart • .510 Beck • .585 Nyati • .600 Overkill • 6.5-284 Norma • 6.8 Western • 8×63mm patron m/32 • 8×68mm S • Nosler cartridges (22 • 26 • 27 • 28 • 30 • 33) • Remington Short Action Ultra Magnum (7mm • .300) • Remington Ultra Magnum (7mm • .300 • .338 • .375) • Winchester Short Magnum (.270 • 7mm • .300 • .325) • Winchester Super Short Magnum (.223 • .243 • .25) |
| Autocannon (20mm+) | 20x70mmRB • 20x72mmRB • 20×80mmRB • 20×101mmRB • 20×110mmRB • 20×128mmRB • 30×90mmRB • 30×92mmRB • 55×175mmRB |
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Cartridges derived from the .284 Winchester or its derivatives (including wildcats)
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| First generation |
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| Second generation |
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