A metallic cylinder packed with shot and used as ammunition in a firearm WordNet 3.0 & Open English WordNet

Canister shot is a kind of anti-personnel artillery ammunition. Wikipedia

A type of artillery round used in warfare as anti-personnel ammunition Wikipedia Disambiguation

Class of ammunition used by artillery Wikidata

A special short range antipersonnel projectile consisting of a casing of light metal, loaded with preformed submissiles such as flechettes or steel balls. The casing is designed to open just beyond the muzzle of the weapon, dispersing the submissiles. Wiktionary

Antipersonnel ammunition consisting of a cylindrical canister filled with round lead or iron balls. Wiktionary

A collection of small projectiles enclosed in a case or canister. Wiktionary