From Mr. Geis (Systems Eng, Eglin AFB): If you are familiar with the definitions and characteristics of explosives versus modern smokeless propellants like those used in small arms, there is much less risk to personnel or property from burning propellants than there is in igniting explosives.  Explosives cause damage by shock and associated flame and heat.  Propellants burn much slower and will make a lot of smoke if not contained in pressure vessels.  The typical small arms cartridge or 1 lb. plastic jar of reloading propellant pose almost zero risk of explosion due to their design and chemical make up.  A heated cartridge in a dept. store fire would expel its bullet at very low velocity due to the lack of a barrel to propel it, while the plastic container of modern smokeless  propellant would cause a lot of smoke but have no explosive effect at all.  No explosives licensed should be required.  If you would like more information please reply, I would be glad to discuss or provide technical resources.