The .222 Remington Magnum is a centerfire rifle cartridge introduced by Remington Arms in 1958. It is based on the .222 Remington but features a longer case, allowing for greater powder capacity and, consequently, higher velocity. This cartridge is slightly longer than the .223 Remington, offering similar performance but is generally less popular.
The primary use for the .222 Remington Magnum is in varmint hunting due to its flat trajectory and high velocity, making it effective for small to medium-sized game at moderate distances. It also saw limited use in benchrest shooting and varmint rifles, though it was largely eclipsed by the .223 Remington.