So I have a 1lb container of AA#5 and an 8lb jug as well. The 1lb container is getting close to empty and I haven't opened the 8lb jug yet. I'm thinking that it might be best to transfer some powder from the larger jug to the smaller container every 1000 rounds or so in an effort to open the larger jug as infrequently as possible. So the question is really 2 parts: 1. Is that a horrible idea? I'm thinking the downside is that there may be slight differences in the powder from one lot to the next and it might not be a good idea for the powders to mix, even though they're both AA#5. 2. Would it be beneficial at all? Can having the big jug open a bunch of times (albeit for extremely short periods of time) and dumping the unused powder back in over and over cause it to not last as long as if I only opened it to refill the 1lb container? Of course there's the obvious benefit of a 1lb container being easier to work with than a large and heavier jug, but I'm more worried about the life of the powder than anything. My reloading bench is in my cool, dry basement so I'm thinking it might not make much of a difference. Thoughts?