That's a good one!....
Those army ammunitions plants have that powder allocated for military use. There was one in karnack, tx that had those little concrete huts that stored 10,000lbs of powder. Those huts were as far as you could see.Years ago in Camden AR, a munitions storage igloo at the old arsenal exploded. It turned out that it was leased to whoever had the Alliant line and 10-20k lbs of powder stored in there. There are dozens of igloos down there.
If I were to guess, I would guess they have 100's of thousands of pounds stored somewhere (excepting the Australian made stuff) and they have it on allocation releasing bits at a time to prevent hoarding. If they released all 200K lbs they had on hand, it would sell out and there would be months or years before it was restocked.
I speculate that this industry does not use the "just in time" model where they don't make it until there is an order from it but am not sure.
In pharmacy, major drug shortages use allocation to prevent major stockouts and scalpers from getting any.