Sorry for posting in an old thread. But. . . . .
I have some slingshot experience. Both the old twirly giant killing kind, and the elastic band wrist rocket kind. Killed a few birds with them, but that's it.
As far as cooking rodents, I've been doing that for a long time. Squirrel is best fried if they are pretty young. If old and tough, you can smother fry them for a long time to make them tender. They will cook on a grill, but they get tough real easy.
Rabbits can be cooked hundreds of ways. I've used most of them. They have enough fat that they do grill pretty good.
Also ate possum once, and coon more times than I can count. Coon can be cooked anyway that pork would be. Possum is greasy, so when my granny made it for me, she baked it in the oven on a broiler with a bunch of sweet potatoes. It was real good.