Features
Physical Data
2.260 in / 57.4 mm
Cartridge Length
182 grains / 11.79 grams
Cartridge Weight
55 grains / 3.63 grams FMJ (copper) boat tail with lead core
Bullet
Minimum of 35 lb (16 kg)
Bullet Extraction
Manufacturer symbol (LC or WMA) and the year of manufacture
Headstamp
Brass (Copper Alloy No. 260)
Cartridge Case Material
No. 41, Boxer Style
Primer Type
Performance
U.S. Military: • MIL-DTL-9963 • MIL-STD-636 • MIL-STD-1916 • Drawing: 10523632
Manufacture Specifications
3,165 ft/s ± 40 ft/s (78 ft frommuzzle) @ 70 ± 2° F / 965 ± 12 m/s (24 m frommuzzle) @ 21 ± 2° C
Muzzle Velocity
Average maximum: 55,000 psi @ 70° F (380 Mpa @ 21° C)
Chamber Pressure
Average mean radii maximum: 2.0 in @ 200 yds / 5.1 cm@ 183 m
Accuracy
-65° F to 125° F (-54° C to 52° C)
Operating Range
For use in standard 5.56 x 45 mm chambers only
Note
More Info » winchestermilitary.com
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