Muzzleloader with gas powered ejection

1. A muzzleloader firearm configured for use with a projectile, a primer, and a propellant vessel containing a propellant, comprising:

a stock;

a barrel supported by the stock, the barrel having a barrel wall defining a barrel bore with a barrel axis, the barrel having a breech end and a muzzle end, a breech plug in the breech end, a propellant chamber forward of the breech plug and a projectile receiving region forward of the propellant chamber, the barrel having a gas port toward the muzzle end, a gas conduit extending from the gas port to the breech plug, wherein the propellant chamber is configured to receive the propellant vessel, and wherein the projectile receiving region is configured to receive the projectile;

the breech plug having a gas passageway connecting to the gas conduit, with at least one gas outlet leading to the propellant chamber, wherein the muzzleloader is configured to be fired with the primer loaded in a primer receptacle and the propellant vessel in the propellant chamber and the projectile forward of the propellant vessel in the projectile receiving region, wherein the gas port is configured to receive gases created by the propellant, wherein the gas conduit is configured to transfer the gases from the gas port to the breech plug, wherein the breech plug is configured to transfer the gases through the gas passageway and the at least one outlet to the propellant chamber behind the propellant vessel to eject the propellant vessel from the barrel.

2. The muzzleloader firearm of claim 1 , wherein the breech plug further comprises the primer receptacle facing rearwardly and configured to receive the primer, the breech plug defining a flash tube extending directly from the primer receptacle to the propellant chamber.

3. The muzzleloader firearm of claim 1 , further in combination with the propellant vessel, wherein the propellant vessel further comprises the primer receptacle facing rearwardly and configured to receive the primer.

4. The muzzleloader firearm of claim 1 , further in combination with the projectile, wherein the projectile has a radially expandable sleeve that is configured to lock the propellant vessel in the propellant chamber.

5. The muzzleloader firearm of claim 1 , further in combination with the propellant vessel, wherein the propellant vessel that has a polymeric containment portion and a plurality of exterior scraping portions that comprise a material which is more rigid than the polymeric containment portion and configured to scrape the barrel wherein when the propellant vessel is ejected.

6. A method of firing a muzzleloader comprising:

loading a propellant vessel having propellant sealed therein,

loading a projectile forward of the propellant vessel;

loading a primer in a breech region of the muzzleloader;

pulling a trigger thereby striking the primer with a firing pin, directing primer gas to the propellant vessel, breaching the propellant vessel by the primer gas, igniting the propellant creating expanding propellant gas, launching the projectile with the expanding propellant gas, tapping the expanding gas from the barrel and transferring the expanding gas to the propellant vessel chamber behind the propellant vessel, and ejecting the propellant vessel.

7. The method of claim 6 , further comprising scraping a barrel wall of the muzzleloader with scraping portions on the propellant vessel as the propellant vessel is ejected.

8. The method of claim 7 , further comprising locking the propellant vessel filled with propellant behind the projectile having a projectile sleeve and a projectile body prior to pulling the trigger by compressing the projectile and the projectile sleeve thereby shifting the projectile sleeve on the projectile such that the projectile sleeve slides onto the projectile body radially expanding the sleeve.