What is Cartridge (firearms)?
[[File:Cartridge Sample 2.jpg|right|500 px|thumbnail|{{center|A variety of rifle cartridges: (1)[[.17 HM2]] (2)[[.17 HMR]] (3)[[.22LR]] (4)[[.22 Winchester Magnum Rimfire|.22 Win Mag R/F.22 WMR]] (5)[[.17/23 SMc]] (6)[[5mm/35 SMc]] (7)[[.22 Hornet]] (8)[[.223 Remington]] (9)[[.223 WSSM]] (10)[[.243 Win]] (11)[[P.O. Ackley#Wildcats and Ackley Improved Cartridges|.243 Win Improved (Ackley)]] (12)[[.25-06 Remington]] (13)[[.270 Winchester]] (14)[[.308 Win]] (15)[[.30-06 Springfield]] (16)[[.45-70 Government]] (17)[[.50-90 Sharps]]}}]] A '''cartridge''' (also called a '''round''', sometimes a '''shell''') is a type of [[ammunition]], consisting of a cylindrical casing (made of metal, usually [[brass]]) that has inside of it a [[bullet]], [[gunpowder]] and [[primer]]. It is made to fit neatly in the [[chamber (firearms)|chamber]] of a gun. This kind of cartridge became usual in the 19th century. [[Category:Ammunition]] {{military-stub}}