I really dont know much on artillery or ballistics, but I am inclined to go along with Krockew and think it might be a mill ball, from another field foreign to me, metallurgy. I have learned a lot from discussions with you guys and others outside our discussions which have included some that brought up these rather mundane utility type objects, which still in thier own right, have become interesting antique items.
I would think that the ovoid shape would lend better to tumbling action, which would be important in crushing ore.
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