According to this URL at sling.org
https://forums.spacebattles.com/threads/the-effectiveness-of-slings-in-warfare.399306/
It refers to an article on this site, held on this site which I cannot find here.
I would like to determine his comments so I would like to read it
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There is a lot of wank thrown at the sling, saying that it can easily punch a hole through armor, saying it has an insane trajectory...etc. Well here is the thread that will debunk any and all myths.
Myth: A sling has an effective range of 400 meters.
Reality: Slings are notoriously inaccurate and most of you won't be able to hit anyone with it. If an iron age warrior were to target an enemy soldier with it, he would have to be within an estimated 30 paces. Even then, expect to take months of training to score a hit 1 in 5 times. I doubt a sling stone can even travel 400 meters, let alone hit something with it.
Myth: Sling stones travel as fast as arrows.
Reality: Slinging.org - The Ballistics of The Sling - Thom Richardson Whoever mentioned this in SB forums (withholding his name so he doesn't get embarrassed) clearly has never taken physics before. The fastest a stone traveled according to this test is 38.3 m/s. This isn't even as fast as medieval wooden arrows, let alone contemporary ones. Heavier projectiles move slower than lighter projectiles, especially if they are launched with an inferior mechanism. That brings us to the third false assumption....
Myth: Slings inflict more damage than javelins and arrows.
Reality: Heavier missile =/= more lethal. Spears and arrows kill by slicing and blood loss, which will fall an unarmored soldier in a different but equally fatal manner. The sling is less effective than the other two at defeating armor because it doesn't hit hard enough to knock someone out of a fight aside from a head shot and its not designed for penetration purposes.
Considering longbows were first wielded in the Stone Age, what surprises me is that slings weren't rendered obsolete.