Quote Originally Posted by Slaists View Post
Well... a stone thrown from a sling would never achieve the speed of a gun-powdered bullet/cannon ball, especially, the modern ones...

As to the sling efficiency against armour: i think, there was a reason by middle ages no european/muslim army unit was specializing in throwing stones around anymore ;)
Well yes, that would be the invention of the crossbow/gunpowder...

Seriously though, the armour worn by EB era troops is radically different than that of the medieval times. Sling shots are effectively a type of ranged blunt trauma, which the standard linen/leather armours of the time didnt protect against very effectively. Compare that to the high quality steel armours of medieval europe.