I've seen that video before and the testing did seem legit, but I would like to share a first had experience that had some potentially different results. We had a structure fire where the owner had literally tens of thousands of rifle rounds in the basement. Long story short, the fire was well involved and the ammo started to cook off. It sounded like a full blown firefight with rounds zipping all over the place. We pulled back and had to wait for things to settle down, using an aerial ladder for the primary attack ( it ended up with an unexplained hole in one of the upper rungs. I have pictures I will try to post that show pock marks in the foundation and the steel basement window frame that I would not want to be on the receiving end of. Now, we did find a shit load of bullets scattered around that just popped without a lot of force, but some defiantly had some force behind them. Bottom line, never a good idea to just assume ammo will just harmlessly pop, not worth it and I won't send my guys into any similar circumstance. Like I said, I will try to post the pics, they tell the story better.