I am really curious as to what kind of lead bullets were used in 43 B.C..
sling bullets.
A slinger was called a Funditor, and the lead bullets might have the word Dexa inscribed on them...that meant Catch! LOL
Those were probably lead slingstones (stone being an expression in that case). The Romans had artillery (the word is even from them I think), but it wasn’t obviously gunpowder-based. ;’) Vespasian, as a general, made his reputation in Britain (if memory serves), reducing British hillforts using Roman artillery of various types.