It is also the size, weight and has smallish hole diameter of many shot-put. These had molten lead poured in to bring them to the correct weight and the hole was then plugged with wood or lead - modern shotput having a screw-plug. Shotput today, unfortunately, generally outnumber surviving shells/grenades making positive identification, without reasonable provenance, such as the subject object has, quite challenging.
Below is a stack I have on display alongside my gunnade. These were acquired from a scrap merchant who had bought them from a local school that closed. These have a similar 'battered' look about them from decades of use. The holes on these particular examples are smaller than the holes I have seen on a number of other shotput.
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