Very interesting find! Roman lead sling 'bullets'

[kronckew]

probably whistled a bit tho. i'd try but my lead casting in the kitchen days are long gone...

as you note, it's a field expedient for when you are away from the supply depot up on the wall staring at the hairy gingers and a bit short on ammo but have some local's roof lead or pipes to scrounge. (arbeia is near the eastern end of hadrian's wall.)