I figure this is probably the best forum for this question, Admin if not please feel free to move.
My question is pretty simple. Modern smokeless powders only. What is a good estimate on shelf life in 2 storage conditions: 1 inside the house where it is temperature controlled and garage where it can go from freezing in the winter to 115° in the Summer.
I know... you can sometimes smell when a powder has 'gone off' but I am curious about long term storage time.