Howdy do,
First time poster, long time admirer.
As a kid on the farm and in the bush I used to sling a bit. Not really knowing anything about it, I made it up, and did it enough to be able to hit a tree stump about 2 ft diameter at about 100 ft.
Years passed and skills declined, and now decades later I find myself drawn to it again. I teach bowmaking, which includes string making. So playing around with threads and fibers is not especially new, but braiding rather than reverse-twisting certainly is.
Recently I've made a very short (
very short) Balearic sling from jute, a couple from paracord for the kids, and a slightly better one from bowstring thread to replace one of the kids' ones.
The Balearic is so short because I had no idea how much shorter the final product would be than the strands I cut. I thought that surely 6 ft strands would be enough for a short but not comical sling...nope, was mistaken. I have learnt from experience that the strands should be 2.5 to 3x the length of the desired sling.
It's also messy, so, hmm.

Aside from bowmaking, I make all sorts of things with wood, metal and my 3d printer. I have all sorts of ideas for jigs and items for use in slinging and the making of things for slinging.
This is a pretty good forum - glad I finally took the plunge!