The most capable small-bore shotgun gauge. Outperforms its payload weight would suggest, beloved by upland purists.
Type: Shotgun
Introduced: 1900, United Kingdom
Parent case: None
Standardization: SAAMI
Bullet diameter: 0.55" (13.97 mm)
Case length: 2.75" (69.85 mm)
Overall length: 3.063" (77.8 mm)
Max pressure: 12,500 PSI
Rim type: Rimmed
Primer: 209 Shotshell
Typical twist rate: N/A (smoothbore)
Muzzle velocity: 1150–1350 fps
Muzzle energy: 500–800 ft-lbs
Effective range: 35 yd
Primary use: Upland Game, Sporting Clays
Production status: Active
Also known as: 28 ga · 28 bore
History: Developed in the early 20th century as a small-bore option. Found a niche with upland bird hunters who wanted lighter guns. Surprisingly effective because its tight choke patterns compensate for the smaller payload.
Notable firearms: Browning Citori, Beretta A400, Remington Model 870
Similar cartridges: .410 Bore, 20 Gauge