Hmmmmmm's initial post was worded badly enough to get everyone's back up, but his basis point is fair - i would guess many of us are not good enough with the sling to 'hunt' with it, in the sense that were we to be stranded in the countryside with nothing else, we would probably starve. Speakling personally I would use my Sling to make Rabbit Snares

But I suspect you could say the same thing about most weapons web sites; I bet 90% of the members of "Rednecks who like shootin off their guns.com" are lard-ass city boys like me.
The sling certainly can kill, and i have spent the last few weeks desperately searching for the references for a discussion some US observers had about watching Ethiopian Regular Army Soldiers using the sling as a grenade launcer !
Last thing, I am a fanatical Atheist, but that wouldn't stop me using the bible as a purely Historical source, esp numbers, judges, kings and the other Israelite / Judean history issues are stored. Most modern historians accept the basic outline of the history of Israel and Judea as covered in the Bible.
(In my view David Killing Goliath with a sling was a bit of a Gyp. Goliath gets all armoured up and issues a challenge to his opposite numbers among the Hebrews... and some kid pops him with a missile weapon ? Thats not in the rules, and were I a Philistine I would have demanded a rematch and a fair fight, and David's head on a plate as a Peace Offering!)
Pat