"Bad" in what way, underprformance, fail to ignite, etc?But, I also recently had a can of IMR go bad at 5 years.
Yike! No, that hasn't happened to me (yet), and yes, I would avoid using that, too!Bad as in red fumes, terrible smell, can rusting through.
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I like the way you think!Don't take a chance.
Load it all up, spend the entire weekend at the range, buy new powder with a born-on date and start over.