The video said he printed his own ammo and showed his reloading equipment. I don’t know where he gets the powder. When growing up, my brother and I made black powder from the recipe in the Encyclopædia Britannica (Ed. 11) and shot a pepper-box we found in the attic. We made our percussion caps from tips of strike-anywhere matches and tinfoil.
I might add that if these people use the internet to communicate, then their government knows who and where they are, and could pick them up with little fuss any time. Time to get out of Europe; it’s a lost cause.
Very resourceful! I learned how to make black powder from a Star Trek Episode.