I have been slinging for many years. I can show you how to make your own sling. We can meet at Palo Alto Baylands, where there are lots of birds for birdwatching – NOT hunting. Coincidentally, the trails at the bay are some of the safest remaining places to sling into, as long as we're aiming into the bay.
Afterwards, we can convene somewhere and cook up some Cornish game hens or the like.