Canister shot

Canister shot is a kind of anti-personnel artillery ammunition. Canister shot has been used since the advent of gunpowder-firing artillery in Western armies. However, canister shot saw particularly frequent use on land and at sea in the various wars of the 18th and 19th century. Canister is still used today in modern artillery. Canister shot consists of a closed metal cylinder typically loosely filled with round lead or iron balls packed with sawdust to add more solidity and cohesion to the mass and to prevent the balls from crowding each other when the round was fired. The canister itself was usually made of tin, often dipped in a lacquer of beeswax diluted with turpentine to prevent corrosion of the metal. Iron was substituted for tin for larger-caliber guns. The ends of the canister were closed with wooden or metal disks. A cloth cartridge bag containing the round's gunpowder used to fire the canister from the gun barrel could be attached to the back of the metal canister for smaller caliber cannon. A sabot of wood, metal, or similar material was sometimes used to help the round during firing from the cannon. Various types of canister were devised for specific models of artillery field pieces. In 1753, the "secret howitzer", a special gun with an oval bore—intended to spread shot even wider—was briefly introduced into Russian service, but ultimately proved unsuccessful. The Royal Artillery Museum at Woolwich, London, holds examples of two early 18th century experimental French wide bore cannon—flattened tubes intended to scatter canister wide but in one horizontal plane. The United States Army developed a canister round, the M1028, for the M1 Abrams' 120mm smoothbore gun in time for the 2003 invasion of Iraq. The effect is to turn a large-caliber gun on an armored fighting vehicle into a giant shotgun. This can be used against enemy infantry even when in proximity to friendly armoured vehicles, as the projectiles do not penetrate armour.