Cannonball, or something else ?

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On a similar theme , I have had this odd item in my possession for 20 years .. it was dug up on a local farm and described to me as a cannonball by the finder. Whilst I doubt it's a projectile , I was hoping someone might recognise what it is . It has a diameter of 80 mm and weighs an astonishing 2.4 kg . It appears to be made of bronze but is hollow and filled with lead .