Cannon balls are done in molds, but they have to be spherical. Are yours round?? They don't look like it in the pictures. If they are not round, perhaps they were used to makes cakes of a metal that they would use later. Kind of like (pig) iron is smelted and cast in molds, to be used later when needed. What a great find. :clapping: Interested to know just what they were used for.