A friend of mine has an 1858 Remington Black powder pistol. He put a cartridge converson on it. The company he got the conversion from said keep the fps under 800. We have a load for that but now he wants to shoot a cartridge load but with black powder. I have black powder revolvers but I have never loaded black powder in a cartridge before. Has anyone done this and if so do you keep the same charge as you would in a regular cap and ball pistol?