Applies to loading of bags with propellants such as black powder or smokeless powder. Contemplates the bag manufacturing in conjunction with code 4771 operations if it takes place within an area exposed to gun powder. Applies to the manufacture of high explosives and nitrocellulose blended with nitroglycerin to produce rocket powders. Contemplates the recovery of chemicals from spent acids or solutions in the manufacturing process. Applies to the manufacture of smokeless powder, pyro or nitro-cotton and nitric or sulphuric acid and other chemical additives provided such chemicals go into the making of smokeless powder. Also applies insureds loading shell cases of 20mm and over with loose or bagged powder, cartridge charging or loading of ammunition for small arms up to and including .50 caliber rounds for machine guns, the loading of shell-type boosters, the loading of projectiles, bombs, mines or grenades and the assembly of caps, primers, fuses, boosters and detonators including the mixing of charges or loading. Applies to the manufacture of fireworks, railroad torpedoes and magnesium flares for aerial photography work and black powder mixtures where black powder is the main ingredient.