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The present invention provides a method of determining the efficiency of a gun cartridge by determining the water weight volume of the cartridge; determining the bore diameter of the gun barrel; determining the weight of the bullet; and calculating the efficiency rating of the cartridge by multiplyi

The present invention provides a method of determining the efficiency of a gun cartridge by determining the water weight volume of the cartridge; determining the bore diameter of the gun barrel; determining the weight of the bullet; and calculating the efficiency rating of the cartridge by multiplying the water weight volume by the bore diameter and dividing by the bullet weight. The efficiency rating is optimal between 110 and 145 when the water weight volume is determined in grains, the bore diameter is determined in thousandths of inches and the bullet weight is determined in grains. One such 50 caliber gun cartridge has a casing diameter of approximately 0.688 inches and neck portion which accepts a bullet having a bore diameter of approximately 0.510 inches. The case has a length ranging from 1.75 inches to 2.5 inches measured from the primer to the mouth of the neck.

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1. An efficient 50 caliber gun cartridge having a proximal and distal end for propelling a projectile comprising: a rimless cylindrical casing having a diameter of approximately 0.688 inches at the distal end and a shoulder at the proximal end angling inward at an angle of approximately 30 degree

1. An efficient 50 caliber gun cartridge having a proximal and distal end for propelling a projectile comprising: a rimless cylindrical casing having a diameter of approximately 0.688 inches at the distal end and a shoulder at the proximal end angling inward at an angle of approximately 30 degrees as a means to allow easier feeding in a machine gun; propellant contained in said cylindrical casing; a primer mounted on said cylindrical casing; and a neck portion extending distally from the shoulder wherein said neck portion has a mouth for accepting a projectile having a bore diameter of approximately 0.510 inches; wherein said casing has a length ranging from 1.75 inches to 2.5 inches measured from the primer to the mouth of said neck; and wherein said length of said casing is dependant upon water weight volume of said casing, said bore diameter of said mouth, and weight of the projectile. 2. The efficient 50 caliber gun cartridge of claim 1, wherein said cartridge with said projectile has a maximum length of 4.0 inches. 3. The efficient 50 caliber gun cartridge of claim 1, wherein said water weight of said casing in grains multiplied by said bore diameter of said mouth in thousandths of an inch divided by said weight of the projectile in grains is greater than or equal to 110 and less than or equal to 145. 4. An efficient 50 caliber gun cartridge having a proximal and distal end for propelling a bullet of a pre-determined weight comprising: a cylindrical casing having a diameter of approximately 0.688 inches at the distal end and a shoulder at the proximal end angling inward at an angle of approximately 30 degrees; propellant contained in the casing; a primer mounted on the casing; and a neck portion extending distally from the shoulder wherein the neck portion has a mouth with a bore diameter of approximately 0.510 inches for accepting the bullet; wherein the casing has a length ranging from 1.75 inches to 2.5 inches measured from the primer to the mouth; and wherein the length of the casing is dependant upon water weight volume of the casing, the bore diameter of the gun barrel, and the weight of the bullet. 5. The gun cartridge recited in claim 4, wherein the water weight of the casing in grains multiplied by the bore diameter of the mouth in thousandths of an inch divided by the weight of the bullet in grains is greater than or equal to 110 and less than or equal to 145. 6. The gun cartridge recited in claim 5, wherein the cartridge with the bullet has a maximum length of 4.0 inches. 7. An efficient 50 caliber gun cartridge having a proximal and distal end for propelling a bullet of a pre-determined weight comprising: a cylindrical casing having a diameter of approximately 0.688 inches at the distal end and a shoulder at the proximal end angling inward at an angle of approximately 30 degrees; propellant contained in the cylindrical casing; a primer mounted on the cylindrical casing; and a neck portion extending distally from the shoulder wherein the neck portion has a mouth with a bore diameter of approximately 0.510 inches for accepting the bullet; wherein the casing has a length ranging from 1.75 inches to 2.5 inches measured from the primer to the mouth; and wherein water weight of the casing in grains multiplied by the bore diameter of the mouth in thousandths of an inch divided by the weight of the bullet in grains is greater than or equal to 110 and less than or equal to 145. 8. The gun cartridge recited in claim 7, wherein the cartridge with the bullet has a