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Jim, ----((Features and Specifications)): - Caliber: .22 WInchester Magnum Rimfire - Category: Rimfire - Bullet Type: Jacketed Hollow Point Projectile - Bullet Weight: 40 Grains - Muzzle Velocity: 1875 fps - Muzzle Energy: 312 ft/lbs - Casing: Reloadable Brass - Quantity: 50 Rounds - Uses: Plinking, Target Practice, Varmint and Small Game Hunting.

Honey, I'm not sure but keep this in mind, it depends on the length of the barrel. For example, if you shoot this out of a North American Arms mini 22 mag then the muzzle velocity will be different versus a carbine length rifle or longer.

Jim. This round has a Muzzle Velocity of 1875 fps out of 20" barrel.