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Can Gunpowder Spontaneously Ignite? Yes! Long-Term Powder Storage Hazards

It's quite rare, especially with modern powders, but it is possible for gunpowders to deteriorate over long periods of time and self-ignite. Here's one case that happened and how to prevent it.

Can Gunpowder Spontaneously Ignite? Yes! Long-Term Powder Storage Hazards
Best practices in storing powder must be followed, and regular periodic checking of stored powder is advised. Dispose appropriately of any that has gone bad.

If you’re a serious reloader, you likely have a dozen or more propellant bottles near your loading bench. A friend of mine had 100+ one-pound containers (77 still factory sealed) carefully stored in his climate-controlled shop. My inventory includes a similar quantity that I’ve accumulated during the 50+ years I’ve been handloading. Let me strongly remind you: Only your acute awareness and rigorous periodic surveillance can avoid a hazardous event. Small arms propellant—even when carefully stored in a safe environment—can chemically deteriorate and, worst case, spontaneously ignite. Fortunately, I’ve never experienced that type of frightening event...

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