Is old powder all bad?
Well YouTuber FortuneCookie45LC tests out and discusses old powder.
Before you buy old powder watch this video.
In my experience, cans with no outer damage and a factory seal should be good to go no matter what the age. It all depends on how they were stored in the past. A cool, dry environment is best. A hot and wet environment is certain the worst case scenario. If you can have a look inside check for clumps, off smells or anything that looks like deterioration. I will not buy or even use open cans of unknown origin. Dump out that old powder (it makes great fertilizer) and enjoy that old can on your collection shelf.
This video does a great job explaining all about old powder and how well it does if stored correctly. Sometimes a bargain is a great deal, while other times a bargain might be anything but that. Be careful.
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