I'm more interested in the Staff sling (mini-me catapult). Surely, that would have been more accurate with longer range. Was popular in the late hellenistic age but quickly vanished ?
As to slings, they were popular in ancient period, mostly against large infantry formations. Slings seems to have decline in the late ancient period and vanished in the European dark ages. I suspect its decline had to do with cultural issues, The Balearic Islands were famous for their slingers, as they declined, no one else took up the mantle ?
You would think Sling missiles would be very effective against armor ?