My BP is in stored a couple of different ways. Most of it is still in the Goex containers, which themselves are in an ammo storage box. While I appreciate JB67's comment that it could turn into a "bomb," I like that these containers have a rubber, water (humidity) seal on top, and feel that the risk:benefit is balanced. I also have smaller amounts of powder left in a horn or a flask that's in a shooting bag. All of this is in my unheated garage. Now that I think about this more, I'll move those ammo cans into my gun safe. It has a pretty good fire rating, which should help with the potential bomb issue (Thanks JB67!).
RE Carbon's suggestion to check the internet, I do think that's a good idea , and I believe that he meant well with that comment. I am guilty of posting a question or two here that could easily be checked online, but I do so because I value opinions of folks here and want to hear from them. Sometimes I seek no other information if it's a minor curiosity, but often I've also accumulated other info from the web too, and then make up my mind on how to balance the info I received from various sources.
I'm a scientist, and that's how science works too. On any given topic, there are different sources of info available, sometimes with smart people supporting different or even opposing views. One considers all of the the arguments and then makes their own decisions. In science, I consider the authors, the caliber of the journal it was published in (peer review quality varies), the data itself, and importantly the methods with which it was obtained and analyzed. In muzzle loading, I consider the logic, the person, the publication source (I consider this forum very high on my list), and when possible, I try to figure out the science or engineering too. I'm less qualified to consider the engineering and science of some of the muzzleloading queries, however I've seen several on this forum who have excellent authority on these subjects--I rely on them a lot. They are giants in our field. I try to thank them frequently, though I'm sure I fall short on this occasionally.