Patent ID: 6240850
Filing Date: 2001-06-05
Classification: F42B

Abstract:
A cartridge comprising:a) a projectile body having upper and lower portions,wherein the upper portion has a torus-shaped surface facing the path of the projectile body upon firing, the torus-shaped surface having associated outer and inner diameters, and a centrally positioned hemispherical indentation attached to said inner diameter of the torus-shaped surface; andwherein the lower portion has a cylindrical shape with a flat base, the cylindrical shape having a uniform circular projectile cross-section throughout its length, with a length to diameter ratio of the projectile body being between 1 to 1 and 1.25 to 1; andb) a strengthened casing fabricated from a cylindrical block having first and second ends by the steps of:forming a chamber having a first uniform circular cross-section, by incrementally removing material from the first end of the cylindrical block such that a cylindrical cavity is formed therein with a base thickness of greater than 0.050 inches;forming an exterior casing wall having a second uniform circular second cross-section with a diameter greater than the diameter of the first cross-section, by removing an exterior thickness of material from an outside portion of the cylindrical block such that a rim is left at the second end; andforming a hole in the second end of the cylindrical block for insertion of a primer therein;the casing and chamber thereby formed by the casing wall and the second end with the hole therethrough, wherein the thickness of the casing wall exceeds 0.050 inches, the casing length to diameter ratio between 4.5 to 1 and 5.5 to 1;the cartridge formed by the installation of a propellant in the chamber, the diameter of the lower portion of the projectile body corresponding to the diameter of the chamber, such that when at least the lower portion of the projectile body is located in the chamber, the chamber is closed.