NRA=National Rock Association
(the anti-gunners would love it
if this were the case).
I have a Brother, named David, who at an early age learned to use a sling, like his name sake. I have seen him sling a rock the size of an orange over 200 feet with some accuracy. We sweated out one throw that nearly hit a Caddie Convertible. They can be a great weapon and ammo is readily available!