i have a wrist-braced slingshot and i've had some fun shooting m-80's straight up. those are real loud [but of course in a survival situation you'd probably use smoke or a flare or something] and they go up quite high. there are 2 problems though: you need to know the fuse time really well [i'm lucky they're consistent, because you have to count 3 of the 4 seconds before launching] and you need someone else to light it [probably]. hmm, you could do it action-hero style with a match in the teeth.... hehehe