From your link:
“The California law does not regulate the reloading of ammunition, or the sale of components such as gunpowder for reloaders, projectiles, wads, cartridge cases or shotgun hulls or primers. Gunpowder and primers have hazmat restrictions, but they could be ordered in bulk by gun clubs. The sale of these items is unrestricted by California law.”
Well, that is nice.
Cap and Ball !