They used Grape Shot for antipersonnel. Which amounted to a canister full of musket balls
Actually there were three methods of anti-personnel shot.
Canister
Grape
AND...,
wait for it.....Skipping solid shot at an angle to an infantry formation. You get more casualties than lobbing the solid shot into the formation from above, and perpendicular to the line, with direct solid shot fire, you had a max potential of three casualties IF they were fighting with three ranks. Two ranks became the norm early on in the AWI.
WHY skip the ball at an angle AND why not use grape? Well the average field piece prior to the 19th century, were from one to three pounders, especially in North America. Easier to move about than the heavier guns. It wasn't until Napoleon at the beginning of the 19th century that the size jumps up to an average of 6-pounders, but often go higher (better roads in Europe at the time you see) So the load of pellets in canister and grape really isn't that much. Can't really take out all that many men unless they are right on top of the cannon and the crew.
And what else do you get with Skipping? You can use grape and canister out to the range of the muskets. Makes the cannon simply a large shotgun. Which means, your cannon crew is within range of volley from from the infantry, and while 3 casualties could be absorbed by an infantry company of 50 men who were shot at with a volley from other infantry..., 3 casualties among a cannon crew after they take a volley takes that gun out-of-action.
Skipping the solid ball into the infantry at an angle..., gives you a better chance of taking out guys AND really bothers the infantry, because they can SEE the impacts of the skipping ball as it travels into them, while at the same time it can be done with the infantry out of musket range to the artillery crew.
Direct Fire...
OR This....,
And it doesn't have to be going that fast. A 3 lb ball is 21,000 grains, so if it comes in at the twice the speed of a major league fastball, say at 180 mph (264 fps), you can see it but you don't to get hit with it. Getting hit with a 90 mph 5 ounce fastball is very painful, but getting hit with a projectile that is 9 times heavier and moving twice as fast ??
Even if you don't hit them but break up their formation..., it will take the sergeants a bit of time to reform the men, and they aren't advancing on your position, AND they are thinking twice about moving forward.
LD