|Place of origin||Australia|
|Case type||Rimmed, bottleneck|
|Bullet diameter||.224 in (5.7 mm)|
|Neck diameter||.265 in (6.7 mm)|
|Shoulder diameter||.360 in (9.1 mm)|
|Base diameter||.375 in (9.5 mm)|
|Rim diameter||.450 in (11.4 mm)|
|Case length||1.85 in (47 mm)|
|Overall length||2.130 in (54.1 mm)|
|Test barrel length: 24"
Source(s): Reload Bench 
The .222 Rimmed is a centrefire rifle cartridge, originating in Australia in the 1960s as a cartridge for single shot rifles, particularly the Martini Cadet action. Performance is similar to the .222 Remington on which it is based however loads should be reduced as the walls of the brass cases are generally thicker. Extraction of cases that have been loaded to higher pressures can be difficult due to the inefficient extraction method utilised by the Martini Cadet.
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