Choosing Powder by Longivity and Stability ?

[preventec47]

Choosing powder by longevity ?
I've got a couple of powders to choose from that probably are neck and neck
in velocity performance but I've read there are lot of advancements in
powders in the way of moisture absorbtion and chemical breakdown over time etc.
Also consistency over wide spreads of temperature but that is not important
to me as I will never be shooting during blistering hot or freezing cold.
I have heard of powders going bad and I dont want that to happen to any that
I buy if I have a choice. I am choosing between Accurate Arms 2460, Hodgden 4895
and Alliant Reloader 15..... and if I could find it the Via Vhitori N-135.

Anyone familiar with the chemical formulations as it relates to breakdown
over time and moisture absorbtion etc ?

[JDL]

Ball powders are supposedly less prone to deteriorate than the stick powders. Store them in a cool place and they will last for years. I still have a pound of surplus WWII powder that works just fine.
JDL

[rost495]

I bought a 200 pound keg of powder mil surp in the 90s, it was made in the late 60s and has been fine. In a copper keg, with a rubber seal on the lid. It is ball powder. Beyond that I'm not sure what makes it bad or good. But heat isn't a friend they claim, yet I won't store 200 pounds of powder in the house....

[Modoc ED]

If you store powder in a reasonable environment (lid tight, moderate temps, etc.), it will probably last longer than you will.