Powder shelf life.

[clemens]

How long does powder last on the shelf before it is opened and after If kept in cool dry place?

 

[Darkker]

There is no simple answer. I've had stuff from the 50's that was perfectly fine, but stuff go sideways on me that was less than 3 years old.

So it just depends.

 

[Rich Coyle]

I've been using some H4831 from World War 2.

 

[wklman]

Got some imr 4064 from the early nineties in the steel container that I still use quite a bit.

 

[RT2506]

I am using some IMR 4895 that was from pulled down M2 ball ammo from the early 1960s and it shoots the same as new IMR 4895. Keep it sealed up good and in a constant mild temperature and it will last indefinitely.