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jdm wrote:Some of the video from Iraq, where the "authorities" burned huge piles of captured terrorist guns, ammo, bombs, rockets, etc. also showed the firecracker sound and rounds cooking off. I'll see if I can find this on youtube.

That firecracker noise would be the primer cooking off, or possibly tightly seated bullets popping out. As has been said, the powder is pretty anticlimactic without the chamber/barrel to contain it and build a lot more pressure than it can manage in just the case.