As long as it has been kept dry as the container you mentioned I am sure it is still very good. I have shot 30+ year old ammunition with no problem at all. But always kept it dry and not exposed to excessive heat. So go shooting and have fun!
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Today, we need a nation of Minutemen, citizens who are not only prepared to take arms, but citizens who regard the preservation of freedom as the basic purpose of their daily life and who are willing to consciously work and sacrifice for that freedom."
Not to hijack the thread but are there any torture tests on ammo to show at what point it will become less reliable or stop working completely? It seems like ammo is good for a long time even in crappy conditions.