The correct procedure to start a fire with a gun is this:
Take one of the cartridges from the gun and pull the bullet from the cartridge. Empty about 2/3 of the powder from the cartridge. Take a small strip of dry cloth or tissue and rub some of the emptied gunpowder into it. It must be small enough to fit back into the cartridge. Place the gunpowder rubbed cloth or tissue into the cartridge. Have your fire and tinder ready. Fire the firemaker round into the ground near the tinder ready fire. With a little luck, the cloth or tissue will be smoldering or will have burst into flames. You may have to experiment a bit to determine exact the the best amount of gunpowder to leave in the cartridge to ignite the wadding and force it out of the barrel without extinguishing it.
“exact the” should be “exactly”