Stevens single-shot target and small game cartridge. Used in the Stevens Ideal and similar falling-block rifles.
Type: Rifle
Introduced: 1888, United States
Parent case: None
Standardization: Obsolete / Non-standard
Bullet diameter: 0.257" (6.53 mm)
Max pressure: 18,000 PSI
Rim type: Rimmed
Primer: Large Rifle
Typical twist rate: 1:14
Muzzle velocity: 1000–1300 fps
Muzzle energy: 144–323 ft-lbs
Effective range: 200 yd
Common bullet weights: 65, 86 gr
Primary use: target, hunting
Production status: Obsolete
Also known as: 25-21 · .25-21 S
History: Stevens Arms' small gallery cartridge for single-shot rifles, circa 1880s. Used for indoor target practice and small pest control. The .25-21 designation indicated .25 caliber with 21 grains of black powder. Superseded by rimfire cartridges for gallery use.