[Fido969]

I don't think old gunpowder is unstable. People who blow themselves up with old ordinance usually have some flame, heat or sparks involved, a grinder, torch, welder, etc. Someone could correct me if I'm wrong.

[Who is John Galt?]

I don't think old gunpowder is unstable.

You might call gunpowder unpredictable (whether new or old). Seems like some professional pyrotechnicians get hurt or killed every July in the US, just handling the stuff...

[rdl6989]

Here’s a story from back in 2008 about a civil war relic collector who was killed when some old ammo went off.

https://www.cbs19news.com/home/headlines/15772557.html