OK! ANY cartridge can be loaded and SAFELY FIRED with black powder instead of smokeless powder.Pressures will be lower than with smokeless powder.
Ballistic performance will be generally quite poor (compared to smokeless powder reloads), and the ammunition will be DIRTY!!
You can use as much black powder in a case as it will take to fill it up and still leaveroom at the case mouthto let you start the bullet. In a shotgun shell, you mustleave room for the wad column and the shot!
To work correctly, black powder needs to be compressed a little by the bullet or shot charge. In a shotgun shell, the powder needs to be compressed a little when you crimp the mouth of the case.
My advice is still DO NOTtry to make your own BLACK powder, but if you want to use BP in a cartridge,
buy the powder. GOEX is a good brand, and Grafs' sells some other brands that are OK too. Use FFFg granulation in pistol cartridges, and FFg or "Cartridge" granulation in rifle cases. I would use Fg or FFg in shotgun shells.
As for safety: Black Powder is a "low explosive", rather than a "flammable solid" likesmokeless powder. As such, it requires
careful handling. DO NOT subject a container of real BP to heat, impact, or vibration/shaking! DO NOT use it in a ferrous metal powder measure. Use wooden scoops or brass powder measures to measure and handleBP.
Be aware that the stuff is dirty/cruddy!! Over 50% of the product of BP combustion is a dirty solid which clings to metal surfgaces, and it is a real pain to clean it out of your guns. In addition, any cartridge cases fired with black powder have to be washed out with hot soapy water after shooting, if you intend to use them again. Hot water is also the best solvent for cleaning the guns. After shooting, I take my Ruger Old Army revolver completely apart, and put all the metal components into a sink full of hot, soapy water. After soaking for about 15 minutes, I use a bore brush inside the barrel and a toothbrush to scrub all the BP fouling off all the gun's metal parts before I oil up the parts andput it back together. A similar treatment is required for the steel components of any gun used with the dirty stuff!
If you are just interested in reloading, use smokeless powder unless you are loading ammo for an oldgun the REQUIRES black powder only!