Years ago, when I was a beginner at reloading .243 brass, I loaded powder that was suspect (beyond its shelf-life), as it smelled peculiar. After loading several, was reading an article that suggested that using deteriorated rifle powder when reloading causes unpredictable pressures upon firing. I remember checking with one of the reload equipment company reps, who cautioned me not to discharge them and dispose of them properly.....unpredicable pressures. I thought he meant unprdictably high pressures, so never shot them. Perhaps, he meant low pressures.
John