For some reason I was of the impression that canister shot was iron, and that cased shot was of iron, lead and even salvaged minie balls and other projectiles. Canister projectiles were just that, shaped like a can with the balls stacked neatly inside and spread much like a shotgun shell when fired. Cased shot was a spherical hollow artillery shell that would explode in the air and spread it's contents as well as iron shrapnel from the projectile itself. But perhaps I was wrong? I can understand that the CSA would improvise out of necessity also. Monty