Great article, few things to point out:
1) Confederate Case shot was originally Lead shot,but due to a lead shortage was replaced by Iron balls. the size of the Iron balls varied from shell to shell. This is what caused the Sideloader shells to be developed, as the drill bits could not drill into the iron case shot to make the powder charge cavity
2) Union Canister also used Iron balls, depending on the size of the weapon depended on the size of the iron balls.
Great read and will be sending this to a couple friends