Black Powder life span
There is a thread on another forum I was reading awhile back. In it a member was talking about the quality of black powder and what was adequate. He said he shot modern powder for plinking and hunting but has a stash of real deal DuPont Black Powder that he uses for competitive use. He said it is around 150 years old and burns cleaner and faster than any of the modern varieties. I don't know how it's being stored but I suspect it is in the original packaging. Sounds to me like it's holding up pretty well!