Post-Exchange Gunpowder Production

[Raellus]

While checking out the Chula Vista Nature Center in San Diego today, I learned that there used to be a gunpower manufacturing plant on the grounds back between 1916-1919. Apparently, the plant removed potash from harvested kelp and then used that potash to manufacture "cordite" which was then sold to the British during WWI. I don't know much about cordite production but this historical tidbit got me thinking about how gunpowder would be manufactured post-exchange. From what I've gleaned from previous, related threads, brass reloading is relatively easy IF compatible propellant is available. Manufacturing that is the hard part. If kelp can be used as part of the process, it stands to reason that access to said kelp could be a strategic consideration, post exchange. I don't know if the Baltic coast features kelp beds...

I guess that modern firearms don't really use cordite anymore but it was used through WWII and, all things considered, it could probably be used used for "new" production ammunition post-exchange.