jeez becarefull jorg youll kill some bugger? has anyone used a slingshot legally for self defence?For hunting, I concur with Fish. a .44 or .45 lead ball is perfect. Good energy and penetration.
For self defense, use a bigger lead ball, like my preferred .75" (19mm). It simply delivers more energy, even though penetration won't be as good as using .44 lead. But the pain the .75" lead ball inflicts is just massive, will instantly stop an aggressor.
Jörg