It can be done, but what you're describing is a rather dangerous process. You'd be better off just to buy new ammo for it.
Yes, police often use powder, such as fingerprint powder, to enhance and lift fingerprints off clothes. This powder adheres to the oily residues left by the skin and makes the prints more visible for collection and analysis.
Hoppe's #9 and a tootbrush
Yes, cocoa powder can stain clothes as it contains natural tannins that act as a dye. It's best to treat the stain promptly with water and a stain remover to prevent it from setting in.
With an impact gun.
As long as your skin is dry, get some baby powder and put it on the places where the sand is sticking to you. It'll rub right off. Weird I know, but it works.
Chances are that if you overload the charge in a revolver style black powder pistol, you can blow up the cylinder or blow the barrel off the end of the gun.
click on the icon in your chest.
Heat them with a hot air gun or hairdryer, then gently peel off with a plastic spatula. Remove the residue with Goof Off.
* Because the King found out about it * King James I caught Guy Fawkes in the act * The gun powder had gone off and so it couldn't be lit and therefore the houses of parliament wouldn't be able to be blown up
It would help if you stated the model.
Cut off the top of the shell, remove the shot and the wad, then pour out the powder. Though, I don't know why you would want to.