depends, because with both, there's always that chance of a back fire. solvents are as easily as dangerous as gun powder. a buddy of mine's father had a bag of old fireworks, he picked the bag up and lost some fingers.
anything can go wrong with shit that is explosive.
Meeeehhhh... the charge used in explosives is much different from the gun powder used in reloading.
I'm not sure what you mean by back-fire.
Explosives are as safe as anything else - IF- you're handling them in a safe manner. Everyone on this board has refueled their vehicle at some point? That's about as dangerous as handling explosives.