Australian/British military cadet training cartridge. Used in the Martini-Cadet rifle issued to school cadets and military training units. Still loaded by a small number of specialty ammunition makers.
Type: Rifle
Introduced: 1898, Australia
Parent case: None
Standardization: Obsolete / Non-standard
Bullet diameter: 0.31" (7.87 mm)
Max pressure: 18,000 PSI
Rim type: Rimmed
Primer: Large Rifle
Typical twist rate: 1:12
Muzzle velocity: 1000–1100 fps
Muzzle energy: 266–322 ft-lbs
Effective range: 200 yd
Common bullet weights: 120 gr
Primary use: military, target
Production status: Discontinued
Also known as: 310 Cadet · .310 Australian Cadet · .310
History: The .310 Cadet cartridge was developed in Australia in the late 19th century for military cadet training with single-shot rifles. A reduced-power cartridge designed to minimize cost and recoil while teaching marksmanship basics. Discontinued as military training programs modernized.