Non-explosive artillery projectile consisting of a sheet-metal canister filled with lead or cast-iron balls. On being fired from a gun the canister is split by the force of the propellant... Found on http://www.encyclo.co.uk/local/20688
Case' shot` (Mil.) A collection of small projectiles, inclosed in a case or canister. » In the United States a case shot is a thin spherical or oblong cast-iron shell containing musket balls and a bursting charge, with a time fuse; -- called in Europe shrapnel . In Europe the term case shot is... Found on http://www.encyclo.co.uk/webster/C/31
Case-shot was an early form of shrapnel shell. Small iron balls were put into a cylindrical box (called a canister) that just fits the bore of the gun. The shell was then fired like any other projectile. Found on http://www.probertencyclopaedia.com/browse/FC.HTM