Some kind of a plug for something? Almost looks like one of the stoppers on
a bottle of "Grolsch": maybe a kind of jury-rigged rivet or stopper?
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> Please find attached a photo of an unknown lead object, found in southern
Illinois. About 3/4 inch in diameter x 7/8 inch long. Certainly looks like
munitions, and may have some rifling traces around base, but seems pretty
unstable in terms of overall shape: