Explosive questions

[weswood]

I've got a couple questions for the demo experts out there.

1- If you taped a lit road flare to a bottle of propane and shot the bottle, would it really blow up, ala Dawn of the Dead?

2- If a pinch of C-4 or other plastique was put in a muzzle loading rifle, would it blow up or not? Not a big piece, maybe as big as the last knuckle of a little finger. I'm thinking it would act like a very quick burning powder, push the projectile out. I'm thinking a .45 octagon barrel about 1" across the outside.

3- Would a tracer ignite gas in a vehicles tank? Civilian car or truck.

Enquiring minds want to know, some explanation would be nice- like the propane bottle wouldn't blow because the pressure coming out of the hole would keep the flame away from the biggest part, sort of like a bunsen burner.