I've been doing a lot of cleanup around my loading area and yesterday, I found a new can of IMR 4350 that is no less than 30-35 years old. I couldn't resist and unscrewed the lid expecting to find the typical degraded powder odor and maybe crumbly grains. NOPE but I'm still not going to use it. Sadly, I have a use for this burn rate powder but not looking to cause problems later.