.222 Remington
| .222 Remington | ||||||||||||||||||||
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| Type | Rifle | |||||||||||||||||||
| Place of origin | United States | |||||||||||||||||||
| Service history | ||||||||||||||||||||
| In service | 1950 | |||||||||||||||||||
| Production history | ||||||||||||||||||||
| Manufacturer | Remington | |||||||||||||||||||
| Specifications | ||||||||||||||||||||
| 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) | |||||||||||||||||||
| Rim thickness | .045 in (1.1 mm) | |||||||||||||||||||
| Case length | 1.700 in (43.2 mm) | |||||||||||||||||||
| Overall length | 2.130 in (54.1 mm) | |||||||||||||||||||
| Case capacity | 26.9 gr H2O (1.74 cm3) | |||||||||||||||||||
| Rifling twist | 1 in 14 in (360 mm) | |||||||||||||||||||
| Primer type | Small rifle | |||||||||||||||||||
| Maximum pressure | 50,000 psi (340 MPa) | |||||||||||||||||||
| Ballistic performance | ||||||||||||||||||||
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| Test barrel length: 24" Source(s): Hodgdon | ||||||||||||||||||||
The .222 Remington or 5.7×43mm (C.I.P), also known as the triple deuce, triple two, and treble two, is a centerfire rifle cartridge. Introduced in 1950, it was the first commercial rimless .22 (5.56 mm) cartridge made in the United States. As such, it was an entirely new design, without a parent case. The .222 Remington was a popular target cartridge from its introduction until the mid-1970s and still enjoys a reputation for accuracy. It remains a popular vermin or "varmint" cartridge at short and medium ranges with preferred bullet weights of 40–55 grains and muzzle velocities from 3,000 to 3,500 ft/s (915–1,067 m/s).