How old is "Old" powder?

[AZshooter]

In the late 60's there was an old gent who was at the range every weekend. He always had several flintlock rifles. They looked like new, so I assumed he built them and was firing them prior to delivery to buyers. Ends up they were a collection passed down from his great grandfather. Most of the rifles had filled powder horns of their own, and he once mentioned that he didn't know anything about granulation of powder, just that he filled the horns from gunpowder casks that were handed down from generation to generation along with the gun collection.

He said he wasn't worried about the powder getting old, and speculated that it was easily pre civil war.

[Stephan]

I had some black powder go bad years ago that I had stored in a powder horn. I believe it was Goex 2F powder and the last of my real-deal BP at that time(when the gooberment first made the real stuff hard to get)

Anyhow..despite everybody saying BP stays good forever...my powder must've absorbed some moisture in the powder horn. It was really weak after some time in the horn(maybe a year or so). The powder still looked ok..and would fire...but it was beyond feeble!

I've had various flavors of Pyrodex noticeably lose efficiency when stored in a brass flask. I about always empty my field powder flasks back into the factory container now. I suppose the moral of the story would be to keep your powder dry??

[JB White]

"...what am I missing..." Spelling. It's spelt sulfur. snicker. Oh and in the Middle Ages, the proportions differed by where it was made. Tended to settle into the ingredients when travelling too. Roads were worse then, than they are now.
BP doesn't have the chemicals in it that create the ammonia smell.

Sulfur in American, sulphur in English. If memory serves, it used to be spelled as sulphre. Our current symbol of a lower case f was used prior to denote the old double S in written words.
So, based upon agile memory, did I pass the spelling test?

[IditarodJoe]

BP doesn't have the chemicals in it that create the ammonia smell.

It's possible. Nitrate will reduce to ammonia under certain conditions.

[Dolt]

For the record, I 'tested' the old black powder. It's fine!
Sorry for the video editing. It was for fun!
(Smokeless line of powder leading up to a little tissue ball of the old black powder)
Link to 14 second video--> https://vimeo.com/176676475

Cool video, I liked the creativity of it!

[Dave in NGA]

did you try pouring a little on the ground and igniting it?

Yes, I tried that once. I was a twelve year old kid looking through my uncles garage where I found a rusted thru can of Dupont black powder. My uncle said to put it in the trash but being a kid I thought burning it on the drive way might prove interesting. Nearly a pound of powder was poured out and matches thrown at it with no result. Then I got the bright idea of lighting it from a cigarette. When I pushed the burning ember into that pile of powder it lit off with a flash like a camera flash. After beating out my hair on fire and looking in a mirror I found a good 'sun burn' on my face and hand. With no eyebrows and crisped hair my father knew what happened but never said a work. Some lessons are best learned the hard way.