March 20, 1 Samuel 17:38-58
So we come to the actual battle between David and Goliath, the primary details of how this young lad killed a giant of a man with a slingshot. He won't wear Saul's armor, it won't fit him and he's never worked in armor. The whole discourse between Saul and David seems a bit odd, the king is allowing a boy to fight this giant. A little history and some interesting facts about slings.
They've been used as weapons for at least 4000 years. They are extremely accurate, today there are groups that practice and compete with primitive weapons to include the sling. A good slinger can hit an 8 inch plate at 100 feet consistently. The rock shape, or bullet shape could be a round ball but more common was a rock or cast lead in the shape of a long football. There are historical records of Roman soldiers being killed by sling bullets penetrating their bodies. So the story here certainly has a lot of credence. That a boy with a lot of time to practice with his sling while watching the flock could certainly hit a man in the head at a distance closer than 100 feet and that the rock with the proper shape could also penetrate the skull. So imagine a rock about the size and shape of a small hen's egg traveling at around 120 miles per hour. Ouch!