A consumable cartridge for a muzzle loading firearm having a consumable cartridge case composed of a consumable solid material is set forth. The cartridge case including a central internal cavity, the cartridge case having a closed first end and a second end open to the central internal cavity for receipt of granular, explosive powder within the central internal cavity of the cartridge case and a bullet is secured to the closed first end of the cartridge case. The cartridge case is shaped and dimensioned for positioning within a bore of a rifle along with the bullet.