.222 Remington

.222 Remington

Description

The .222 Remington, 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 cartridge made in the United States. As such, it was an entirely new design, without a parent case. Wikipedia
 
Rifling twist1 in 14 in (360 mm)
Case length1.700 in (43.2 mm)
Case capacity26.9 gr H2O (1.74 cm3)
Rim diameter.378 in (9.6 mm)
Base diameter.376 in (9.6 mm)
Shoulder diameter.357 in (9.1 mm)