The caliber of the shotshell is known as its gauge. The shell casing usually consist of a paper or plastic tube mounted on a brass base holding a primer, and the shots are typically contained by a wadding/ sabot inside the case. A shell can sometimes also contain only a single large solid projectile known as a slug, fired usually through a rifled slug barrel. From left to right: brass, propellant, over-powder wad, shot wad, #8 birdshot, over-shot wad, and crimpĪ shotgun shell, shotshell or simply shell is a type of rimmed, cylindrical (straight-walled) cartridges used specifically by shotguns, and is typically loaded with numerous small, pellet-like spherical sub- projectiles called shot, fired through a smoothbore barrel with a tapered constriction at the muzzle to regulate the extent of scattering.
A 12-gauge shotgun shell in a transparent plastic hull, allowing the contents to be seen.
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