Actually grape shot was linked together with a chain, raised he** with a troop formation. What you are referring to is called canister. Canister was still in use back in the 1950s-'60s when I was in the army. It was used extensively in the Pacific against the Japanese during WWII, usually out of 37MM cannon.
That's "chain shot". Used a lot on sailing ships to tear up rigging, but also used on land. Grape shot were just bags of oversized musket balls. Later, they started putting it into metal canisters which blew apart when they left the barrel. About the same time a British artillery officer named Henry Shrapnel came up with a way to make a shell lined with grapeshot that exploded over the enemy's heads.