Wats the best hunting slingshot i can buy and is there anyone who has been succesful at hunting with it?

Get a cyclone. An all ways buy extra slings, they brake on you when you don't expect it. I hunt birds with mine but have managed to kill possums. Use lead sinkers the size or normal marbles and you should be good. Dont use those shitty metal bb's. They don't work. They are only good when you put 3 or 4 in the pouch and shoot at small or flying birds.