Buying second hand/used powder?

About 3-4 years ago, I was given 7 lbs of Hercules Infallible powder with no idea of date of manufacture. Hercules Infallible was manufactured between 1898 and 1948. I have been using it for .38 Spl Cowboy Action loads for the last 3 years and I have enough loaded for 1 more season of shooting. Every time you come across propellant that has been manufactured 20+ years ago, you must consider the packaging and the storage conditions if you know them.
 
I bought an old can of 3031 and saw there was rust inside the can. Even the powder looked rusty. Long story short: it shot as it should. Sometimes, if the price is good, you take chances.
 
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