6.5-284 Norma

The 6.5-284 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
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(s): [1],[2][3]

History

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

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] In contrast, most hunting rifles show similar accuracy at 100 yards (91.4 m) to 200 yards (182.9 m). 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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gollark: Interesting features:- all numbers are hexadecimal always- it has no support for immediate parameters which aren't addresses or something- there are no registers and exactly 256 bytes of memory, one of which is the program counter- conditional moves are the only conditional thing
gollark: ```x86asm!PAD E0LOOP:re 8 RIadd RJ RI !1mez RJ I !0re 8 RJidm RI RJmov I !LOOPRI: ! 0RJ: ! 0```Here is some example code.

See also

References
  1. https://fusiontables.googleusercontent.com/fusiontables/embedviz?viz=CARD&q=select+*+from+1C5o2xk_hWmBsTsTUWwoZ262XZOtOsNloF2QDW28+where+col4+%3D+14605+order+by+col0+asc&tmplt=1&cpr=1
  2. http://www.hodgdonreloading.com/data/rifle
  3. https://fusiontables.googleusercontent.com/fusiontables/embedviz?viz=CARD&q=select+*+from+1C5o2xk_hWmBsTsTUWwoZ262XZOtOsNloF2QDW28+where+col4+%3D+14615+order+by+col0+asc&tmplt=1&cpr=1
  4. DeSimone's Dynamic Duo - 1000-Yard Record Rig (Reborn) and Classy New Curly Ash 6.5 Super
  5. Sarver Shoots 1.403″ Group at 1000 Yards
  6. http://www.eabco.com/6.5_mm_cartridges.html
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