5mm Remington Rimfire Magnum Ammunition

5mm Remington Rimfire Magnum (5mm RFM) is a rare and powerful rimfire cartridge that delivers exceptional velocity, flat trajectory, and small game hunting performance. Originally introduced in the 1970s by Remington, this high-speed rimfire round offers greater energy and penetration than most other rimfire cartridges, including .22 WMR.

Ideal for varmint control and precision plinking, 5mm RFM typically fires a 30-grain bullet at over 2,300 feet per second, making it one of the fastest rimfire options available. While it had a brief production run initially, demand among rimfire enthusiasts has revived interest, with ammunition now produced by companies like Aguila Ammunition.

Designed for use in rifles like the Remington 591 and 592, this unique cartridge combines centerfire-like performance in a rimfire platform.

Note: 5mm RFM is NOT interchangeable with .22 WMR, .22 LR, or other rimfire cartridges. Verify your firearm’s chambering before purchasing. Limited production runs—when available, stock up.