California Code of Regulations
Title 19 - Public Safety
Division 1 - State Fire Marshal
Chapter 10 - Explosives
Subchapter 4 - Use and Handling of Explosives
Article 12 - Small Arms Ammunition, Small Arms Primers, Smokeless Powder and Black Sporting Powder
Section 1574.6 - Product Display

Not more than twenty (20) pounds of smokeless powder, in containers of one (1) pound capacity, or more than one (1) pound of black sporting powder shall be displayed in commercial establishments. (Note: These quantity limitations may be waived by the "Chief" having jurisdiction when the powders are not handled by the public.) Commercial stocks of smokeless powder over twenty (20) pounds (but not exceeding one hundred (100) pounds) and stocks of black sporting powder over one (1) pound (but not exceeding twenty (20) pounds) shall be stored in separate approved wooden boxes having walls and covers of at least one (1) inch nominal thickness. Not more than fifty (50) pounds shall be permitted in any one box.