Patent ID: 7987790

Claim:
A munition for firing in a barrel of a breech loading gun, comprising: a circular base supported within the breech, said base including a primer and having a combustion chamber containing a propellant, said base including a vent for directing combusted gas from the chamber, said base having a periphery in sealing contact with the barrel; a generally cylindrical rod extending toward a muzzle of the barrel from the center of said base; a ring airfoil projectile adapted and configured to be fired from within the barrel; a sabot having a central passage that accepts therein said rod, the central passage and said rod being in sliding contact, said sabot having two opposite surfaces with one surface facing said base and being in fluid communication with the vent and the opposing surface being adapted and configured to push said projectile; wherein firing of the primer ignites the propellant to provide a quantity of combusted gas flowing through the vent and acting on the one surface of said sabot to push said projectile through the barrel; said projectile separates from the sabot prior to reaching the muzzle of the barrel.