Personally I wouldn't be too concerned about old ammunition as the amount of powder in them is very small. But if you're concerned about it by all means get rid of what you have. The problem comes from having bulk powder decompose and the resultant heat buildup causes it to ignite spontaneously. In my particular case there was several pounds of WW-2 rifle powder in two plastic jugs that I knew was going bad and I didn't pour it in a bucket of water as I intended. I had planned on putting it on the lawn as fertilizer and just didn't get to it soon enough.
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