Long-range precision firearm cartridge

Abstract

A long-range precision firearm cartridge case including a cylindrical body portion with a head end and an opposite end, the cylindrical body portion having a central aperture extending into the head end for receipt of a primer, and the cylindrical body portion having a cartridge extraction groove formed around the periphery of the body portion adjacent the head end. The case including a cylindrical neck portion and a frusto-conical shoulder portion integrally formed with the body portion and the neck portion. The shoulder portion tapers radially inwardly from the opposite end of the body portion to the cylindrical neck portion. The neck portion extends longitudinally from the shoulder portion to define a projectile receiving end. The frusto-conical shoulder portion is constructed to form a shoulder angle with a longitudinal axis of the body portion, the shoulder angle being greater than 30 degrees and no greater than ninety degrees.

1 . A long-range precision firearm cartridge case comprising:
 a cylindrical body portion with a head end and an opposite end, the cylindrical body portion having a central aperture extending into the head end for receipt of a primer, and the cylindrical body portion having a cartridge extraction groove formed around the periphery of the body portion adjacent the head end;   a cylindrical neck portion;   a frusto-conical shoulder portion integrally formed with the body portion and the neck portion, the shoulder portion tapering radially inwardly from the opposite end of the body portion to the cylindrical neck portion;   the neck portion extending longitudinally from the shoulder portion to define a projectile receiving end; and   the frusto-conical shoulder portion constructed to form a shoulder angle with a longitudinal axis of the body portion, the shoulder angle being greater than 30 degrees and no greater than ninety degrees.   
     
     
         2 . The long-range precision firearm cartridge case claimed in  claim 1  wherein the neck portion has a length greater than the diameter of a bullet or projectile received in the projectile receiving end. 
     
     
         3 . The long-range precision firearm cartridge case claimed in  claim 1  wherein the body portion tapers radially inwardly from the head end to the opposite end, the amount of taper being less than 0.01 inches per inch of the body portion length. 
     
     
         4 . A long-range precision firearm cartridge case as claimed in  claim 1  including a firearm chamber reamer for use with the cartridge case. 
     
     
         5 . A long-range precision firearm cartridge case comprising:
 a cylindrical body portion with a head end and an opposite end, the cylindrical body portion having a central aperture extending into the head end for receipt of a primer, and the cylindrical body portion having a cartridge extraction groove formed around the periphery of the body portion adjacent the head end;   a cylindrical neck portion;   a frusto-conical shoulder portion integrally formed with the body portion and the neck portion, the shoulder portion tapering radially inwardly from the opposite end of the body portion to the cylindrical neck portion;   the neck portion extending longitudinally from the shoulder portion to define a projectile receiving end;   the frusto-conical shoulder portion constructed to form a shoulder angle with a longitudinal axis of the body portion, the shoulder angle being greater than 30 degrees and no greater than ninety degrees;   the neck portion having a length greater than the diameter of a bullet or projectile received in the projectile receiving end; and   the body portion tapering radially inwardly from the head end to the opposite end, the amount of taper being less than 0.01 inches per inch of the body portion length.   
     
     
         6 . A long-range precision firearm cartridge case as claimed in  claim 5  including a firearm chamber reamer for use with the cartridge case. 
     
     
         7 . A long-range precision firearm cartridge comprising:
 a cartridge case including:
 a cylindrical body portion with a head end and an opposite end, the cylindrical body portion having a central aperture extending into the head end for receipt of a primer, and the cylindrical body portion having a cartridge extraction groove formed around the periphery of the body portion adjacent the head end; 
 a cylindrical neck portion; 
 a frusto-conical shoulder portion integrally formed with the body portion and the neck portion, the shoulder portion tapering radially inwardly from the opposite end of the body portion to the cylindrical neck portion; 
 the neck portion extending longitudinally from the shoulder portion to define a projectile receiving end; 
 the frusto-conical shoulder portion constructed to form a shoulder angle with a longitudinal axis of the body portion, the shoulder angle being greater than 30 degrees and no greater than ninety degrees; 
 the neck portion having a length greater than the diameter of a bullet or projectile received in the projectile receiving end; and 
 the body portion tapering radially inwardly from the head end to the opposite end, the amount of taper being less than 0.01 inches per inch of the body portion length; 
   a primer fitted into the central aperture extending into the head end in communication with a flash-hole;   combustible propellant in the body portion; and   a projectile fitted into the projectile receiving end.