Around 2018 I got obsessed with slings - I've made a couple from paracord and was practicing almost every day. After about a year I only managed to consistently launch stones in the rough desired direction. Another (COVID) year and got to the level where my spread was about 5 degrees. Systematically hitting a reasonably sized target was still beyond my ability. Plus early symptoms of tennis elbow...

Slinging is hard, requires a lot of dedication and systematic practice. Stil, the feeling when the rock hits a target and "explodes" is worth it.