5mm Remington Rimfire Magnum - 5mm RRM

5mm Remington Rimfire Magnum – 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.  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.

The 5 mm Mag offers higher velocity than the .22 WMR and more energy than either the .22 WMR or the later .17 HMR. It offers improved performance on small-game and for varmint hunting, along with excellent accuracy. The Aguila/Centurion 5mm Remington Magnum ammunition comes in two offerings: the original “White Box” with a 30gr dimpled jacketed soft point at 2300fps, as well as a Varmint “Yellow Box” round with a 30gr jacketed hollow point at 2400fps. Chronograph testing has shown that these rounds can actually run about 100fps faster than claimed by Aguila.