Never tried a netted sling. How do you like them compared to leather?
Leather pouches are easier to make but I don't notice any difference in performance. The reason I started making netted slings is because a buddy who is in his 60s now, said when he was a kid, netted slings were all they used. Probably because when he was a kid he used to make nets for the fishermen on the east coast (Newfoundland). At first, I had a bit of a problem making them 'pouch' properly, but managed to work that out. In the top picture, the slings were made out of nylon, butcher's cord, and jute. The bottom picture is jute. I've tried to find a tougher cordage than jute, including waxed net cordage, but nothing I have found so far, holds a knot as well as jute.
For the most part, jute works well, but another buddy, who likes to sling cement blocks (ok, maybe a bit of exaggeration) finds the jute cordage abrades fairly quickly, allowing the strings to break. Mind you, I have pointed out to him that early people, using natural cordage, would have the same problem when slinging heavier ammo.
One of the joys of making a sling, is that you can almost use anything to make one. On one discussion form, a guy made a sling incorporating kind of a can in which he would put multiple stones and used it like a primitive shotgun for birds. I'll see if I can find a picture.