lead was used as a sling ammo.
"sling bullets" they do more dmg then stone sling ammo.
and it was even possible to sling darts (arrows)! its tricky, but with enough training doable.
and something else: atl atl: (spear thrower)
for simplisity i suggest the atl atl works with arrows.
but when small spears become a thing, they could be used.
