Patent ID: 8869701

Claim:
A cartridged projectile comprising: a hollow cartridge case extending from a base; wherein said base comprises a high pressure chamber formed therein; a threaded hole in communication with the high pressure chamber, with said threaded hole opening into a low pressure chamber defined by an interior of said cartridge case and a rear end of a projectile seated at a mouth of said cartridge case; and a shoulder between the high pressure chamber and the threaded hole; a nozzle ring with an inner surface comprising a tapered or conical bore, with the narrower end of said tapered bore opening into a discharge hole, so that said nozzle ring is seated in said threaded hole and said discharge hole opens into said low pressure chamber; and a pressure disc disposed between said shoulder and said nozzle ring, with a surface of said pressure disc facing the tapered bore being scribed with intersecting V-shaped cross-sectional grooves.