I have some 2F that is near 40 years old, works just dandy. Historical record recounts BP kegs found in old mines estimated to be 150 years old or so...still viable.
The owner of Hodgdon Powder Co, who was one of my customers in the Wholesale Firearms Industry several years ago, told me the same thing. Said they had some at the Factory that was well over 120 years old. that they tested from time to time.
