I have enough primers to last a while.
Meanwhile, I bought a Brown Bess. 75 cal/11 Gauge bore. It fires ball, shot, pea gravel, whatever. I can dig flint from a local road cut and I bought a lifetime's worth of sulphur and potassium nitrate. When that latter peters out, I know how to make it from grass clippings and urine.
I'm about to do the burn for my first batch of charcoal. I also have a cache of lead that's good well into the next generation.
My finished product will be Revolutionary War-level black powder-- perfect for the 'Bess. Once it's made, it will store for 100 years or more. They improved the process after 1800 and what you know now as BP is about 25% more powerful. If I take what I'm making and run it through a hydraulic press, dry it, and regrind it, I can probably match Goex or Swiss.
