With Pyrodex or 777 I just pull the breech plug. BUT with Black Powder, I inject water or WD-40 through the flash hole with a hypodermic, before pulling the plug. With water it takes two or three times to get it all wet. With WD-40 it readily penetrates loose powder or pellets. Here in Alaska we have very low humidity, and the air is charged with static. Better safe than sorry. Also a few years ago my best friend, set off a container of Black Powder, just by reaching for it, after walking across the rug in my room. He lost all his hair, brows, lashes, and moustach. His face blistered, but no permanate damage or scarring. And he could not hear for several hours. All because of one little spark.