Itll hit harder than a .22 thats for sure.
But the accuracy is the problem. In general your accuracy is equivalent on this scale, in this order:
Bow (no sights)
Full Size Crossbow
Light Carbine or Submachinegun
(and ill stop there)
With lots of practice and work you can get good with a slingshot, but much less practice is necessary for the same accuracy or better with another more accurate weapon. They’re just more accurate and the same amount of practice will make you deadly at their enhanced ranges.