>>And I'm pretty sure he didn't use a slingshot.
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>Please elaborate.
A slingshot uses a rubber band. A sling is the weapon that David used. Slings are just lengths of rope or leather with a pouch in the middle. In ancient times they were as good as the bows of the times, though later they were surpassed. Balearic islander slingers were used by Caesar along with archers; Roman slingers used lead projectiles. The projectiles were quite heavy, on the order of 28.3 grams (thus dangerous when launched upwards).