A kestrophendone dart would actually be closer to 1-2 feet long , with a wooden shaft and a heavy head. The fins would also have to be either strong plastic or wood, as they actually need to have a special sling to be thrown with: similar to a sierra-Nevada sling, but thinner, and the pouch is uneven( one cord is longer than the other)
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using this model, it was said that a rang of 100 m is easily achievable ( if ur able to do it with a sling in the first place, anyhow)
i would imagine that one would use a byzantine sidearm, though this is purely personal opinion.
also:
http://slinging.org/forum/YaBB.pl?num=1074713443/0i do remember from another source someone trying out the version with the leather pouch, and it greatly under-performed compared to the one posted above.