.222 Remington Magnum

.222 Remington Magnum
TypeRifle
Place of originUnited States
Production history
DesignerRemington
Designed1957
Produced1958–present
Specifications
Parent case.222 Remington
Case typeRimless, bottleneck
Bullet diameter.224 in (5.7 mm)
Neck diameter.253 in (6.4 mm)
Shoulder diameter.357 in (9.1 mm)
Base diameter.376 in (9.6 mm)
Rim diameter.378 in (9.6 mm)
Case length1.850 in (47.0 mm)
Overall length2.280 in (57.9 mm)
Rifling twist1-12 in (300 mm)
Primer typeSmall rifle
Maximum CUP50,000 CUP
Ballistic performance
Bullet mass/type Velocity Energy
40 gr (3 g) SP 3,818 ft/s (1,164 m/s) 1,295 ft⋅lbf (1,756 J)
50 gr (3 g) SP 3,476 ft/s (1,059 m/s) 1,342 ft⋅lbf (1,820 J)
55 gr (4 g) SP 3,294 ft/s (1,004 m/s) 1,325 ft⋅lbf (1,796 J)
Test barrel length: 24"
Source(s): Hodgdon

The .222 Remington Magnum was a short-lived commercially produced cartridge derived from the .222 Remington. Originally developed for a US military prototype ArmaLite AR-15 rifle in 1958, the cartridge was not adopted by the military, but was introduced commercially in sporting rifles.

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