[6][7][8][9] 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 (0.20 in) at 37,000 psi (260 MPa).

Some firearms manufacturers even created conversion kits to allow the existing 5 mm guns to shoot other more-common cartridges.

[6] It offers improved performance on small game and for varmint hunting, along with excellent accuracy.

[12][13] His company, Certech, also performed conversions of 5 mm rifles from rimfire to centerfire by altering the bolts and installing new firing pins, restoring them to use.

[5] At the 2008 SHOT show, Taurus International introduced the first handgun chambered for the 5 mm Remington Magnum Rimfire.