Powerful rimfire magnum. Roughly double the energy of .22 LR. Excellent for small game and varmints. Popular in revolvers for trail/defense.
Type: Rimfire
Introduced: 1959, United States
Parent case: .22 WRF
Standardization: SAAMI
Bullet diameter: 0.224" (5.69 mm)
Case length: 1.052" (26.72 mm)
Overall length: 1.35" (34.29 mm)
Max pressure: 24,000 PSI
Rim type: Rimfire
Primer: Rimfire
Typical twist rate: 1:16
Muzzle velocity: 1875–2300 fps
Muzzle energy: 300–325 ft-lbs
Effective range: 125 yd
Common bullet weights: 30, 33, 40, 50 gr
Primary use: Hunting, Varmint, Self Defense
Production status: Active
Also known as: .22 Magnum · .22 Winchester Magnum Rimfire
History: Introduced by Winchester in 1959. Designed for longer-range rimfire hunting. Gained popularity with Ruger Single-Six convertible revolvers. Parent case for .17 HMR.
Notable firearms: Ruger Single-Six, Savage Mark II, Kel-Tec PMR-30, Marlin 882
Similar cartridges: .17 HMR, .22 LR