@KevenM,
Dude, it's a story - not really history. How can you research a fantasy? Besides which I thought in the bible it was alleged to be a slingshot. (Books of Samuel (1 Samuel, Chap 17.)
"So David prevailed over the Philistine [Goliath] with a sling and a stone, striking down the Philistine and killing him."
The biblical account describes Goliath as falling on his face after he is struck by a stone that sank into his forehead.
"Biblical Scholars drawing on studies of oral transmission and folklore have concluded that the non-Septuagint material “is a folktale grafted onto the initial text of … 1 Samuel."