slingshot/catapult hunting is legal.
Hunting with a sling should not be allowed. The video pretty much ephasises why.
The style might be accurate, but it's almost impossible to generate any real power with that style.
So in the unlikely event you ever hit an animal, all you will do is injure it.
Given that in the uk all you'll be hunting is rabbits and squirrels anyway. What you will do is leave a trail of injured animals behind you.
Any sling style that includes a windup, is not overly suitable for hunting - that's expecting a lot of an animal to not notice all that lead up movement. One reason you need to be a fair distance away.
Hitting a moving animal at 40 yards is extremely difficult.
But it is far more practical than expecting it to stand still while you windmill 10 yards away.
I can think of only two people I know in the slinging world who i would expect to be able to survive by hunting with a sling. Luis and jaegoor.
I've never seen anyone else with their kind of pinpoint accuracy and power at random distance targets.
Both practice obsessively and it shows.
I could do it - but I'd cheat
Exploding glandes, bolas glandes, baiting the killing ground with drugged food etc
Here's a challenge. Go to a clay pigeon range. And if you can hit 50% of the targets with your sling - then you might be good enough to hunt with a sling.
If not, don't even try it - all you'll be doing is pointlessly injuring animals.
I'm not anti hunting. I process a lot of game my dad shoots.
I am against treating it as a game and doing it in a manner where you are 90% likely to injure rather than kill.
For survival purposes, pack a decent catapult with non-degradable silicon bands and a bag of .38 calibre ball bearings. When the bearings run out, fit the whisker biscuit you also put in the pack and make short arrows.
Get your sling (paracord if you've got any sense) Make fishing line from the core and use the main cord for a snare. For almost every sling user on the planet, it's probably the best use for a sling in survival situation