You can substitute powdered sugar for charcoal as it has about the same amount of carbon in it. 70% saltpeter, 20% charcoal, and 10% sulpher.
Any kid in high school chemistry can make it as well as other bombs and such.
A 1/2" black iron pipe used in gas plumbing, with a short piece of 3/4" slid over it at the base. Leave a 3/4" slightly over the 1/2" and you have a 20 gauge barrel with the indention for the rim of the shell. A block of steel behind with a hole drilled in the center can make the firing pin. There is a You Tube video of how someone made a 20 gauge single shot shotgun using the pipe method. Kind of heavy, but with cylinder bore, makes a good short range bird or small game gun. Then it could shoot slugs or buckshot too. He showed how to make the trigger assembly, etc. Used pallet wood for stock and forearm. Probably spent more time making it in hours than buying one old H&R.
A Teenager Built This Homemade Pistol With a Hacksaw, Files, and Hand Drill
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