5 mm Remington Rimfire Magnum
| 5mm Remington Rimfire Magnum | ||||||||||||
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| Type | Rimfire | |||||||||||
| Place of origin |
 United States
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| Production history | ||||||||||||
| Designer | Remington Arms Company | |||||||||||
| Designed | 1969 | |||||||||||
| Manufacturer | Remington | |||||||||||
| Produced | 1971-1973, 2008-present | |||||||||||
| Specifications | ||||||||||||
| Parent case | none | |||||||||||
| Case type | Rimfire, bottleneck | |||||||||||
| Bullet diameter | .204 in (5.2 mm) | |||||||||||
| Neck diameter | .225 in (5.7 mm) | |||||||||||
| Shoulder diameter | .259 in (6.6 mm) | |||||||||||
| Base diameter | .259 in (6.6 mm) | |||||||||||
| Rim diameter | .325 in (8.3 mm) | |||||||||||
| Rim thickness | .050 in (1.3 mm) | |||||||||||
| Case length | 1.020 in (25.9 mm) | |||||||||||
| Overall length | 1.30 in (33 mm) | |||||||||||
| Primer type | Rimfire | |||||||||||
| Maximum pressure | 33,000 psi (230 MPa) | |||||||||||
| Ballistic performance | ||||||||||||
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| Source(s): "Cartridges of the World", "Varminter.com" | ||||||||||||
The 5mm Remington Rimfire Magnum or 5mm RRM is a bottlenecked rimfire cartridge introduced by Remington Arms Company in 1969. Remington chambered it in a pair of bolt-action rifles, the Model 591 and Model 592, but the round never became very popular, and the rifles were discontinued in 1974. About 52,000 rifles and 30,000 barrels for the T/C Contender pistol were sold during its brief production run. Remington discontinued the cartridge itself in 1982, leaving owners with no source of ammunition.
In 2008, the cartridge was reintroduced by Mexico's Aguila Ammunition in collaboration with Centurion Ordnance.
Remington designed a completely new, bottlenecked case that was somewhat similar to the older .22 Winchester Magnum, but stronger to handle the higher pressure of the 5 mm at 33,000 PSI. It uses a 5mm (.204 caliber) bullet that measures 0.2045 inches (5.19 mm), the same as the more recent .204 Ruger center fire cartridge.
From 1982 until 2008, no ammunition manufacturers manufactured rounds for this cartridge. Some firearms manufacturers even created conversion kits to allow the existing 5 mm guns to shoot other more-common cartridges.
At the 2008 SHOT show, Aguila Ammunition announced they would reintroduce the cartridge and begin producing 5mm RMR ammunition in 2008. The cartridges are now available on the U.S. market branded as Centurion.
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Wikipedia