I found three colors of powder from various brands that reliably coat well under all of the conditions here in So. Flo. I shoot quite a bit for the average shooter, say 200/400 rounds a week and I like to have several thousand bullets and finished cartridges on hand.
The supplier I'm using has a finite amount of powder he bought in bulk and will not be able to replenish any of it. That said, I know this is a tough question to ask but I have two pounds of each color I like on hand and want to get more to hedge my bets that I do not run out in the foreseeable future. Question, if I keep my powder double bagged in ziplocks is there a "use by" or shelf life of powder? I'm thinking an additional two pounds of each color should get me by for a VERY long time?