I notice that most of these posts report powder stored in some hot areas for a long time before use or unknown stored milsurp powders. I store all mine in the back bedroom closet the same as my grandfather used to do. I took in his old powder collection when he passed and have just recently used the last of his stash. I had some older metal can powders and I'm not sure when 2400 was rebranded as Alliant but this was a lot of older Herc powder. Not a bit of it was bad and everything went bang with the pull of the trigger.