Powder storage?

[Krazykarl]

All of my usgi ammo cans did the same thing. Moved from 4300 feet to 700 feet. All were slightly sucked in and all gave a satisfying hiss when opened as the gasket gave way.

[lowprone]

Keep powder in cool , dry place away from direct sunlight should last a very long lime.
I have what is left of one of the old cardboard 8lb containers of Bullseye and the powder
is still producing accurate loads.
Must be 20 years at least.

[tommyrott]

I bought a 20 year old jug of accurate 2230, but that ended up being stored like markm, and pappabear store their powder in individual cartridges. Never had a problem with that jug. I have moved the tote I have all my powder stored in into an air-conditioned room till I get my loading setup running, thanks for the info

[Yooperboy]

15 years ago I moved to Co. 7500' from Marquette, Mi. Just reloaded some unique powder from that date in my 9mm. Still good. Kept it in an ammo box in a closet. When I moved, the can was slightly bulged, equalized it and been fine. Just used the last of it loading up 147gr xtp hornady.