Re: survival idea
and smokeless isn't really gonna go bang with no pressure either. Black powder would but it's so quick, doubt anyone would see it.
build a fire if you can and shoot your distress signal is my vote also if you're stuck
I carry pen gun flares with me in the survival kit but also a roadside fuse, those things are bright! they can be seen 30+ miles, ask me how I know
"Loud noises don't end gunfights.... well placed shots do."