.222 Remington Magnum

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.222 Remington Magnum
Type	Rifle
Place of origin	United States
Production history
Designer	Remington
Designed	1957
Produced	1958–present
Specifications
Parent case	.222 Remington
Case type	Rimless, 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 length	1.850 in (47.0 mm)
Overall length	2.280 in (57.9 mm)
Rifling twist	1-12 in (300 mm)
Primer type	Small rifle
Maximum CUP	50,000[1] 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 [2]

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.