Did a little beach combing yesterday at a new beach adjacent to an early fort. Eyeballed the iron ball which may be canister or grape shot...or may be just a random iron ball...
Random iron ball?
If someone made something like this there had to be a reason.
Agriculture, mechanical uses...or war.
In this case I say war.
Here is a canister shot I found, kinda looks like yours.
Case shot, grape shot canister shot, similar but could be slightly different sizes.
Mine is about 1 3/4" and about 1.5lbs.