Cartridge for a firearm

Abstract

A long-range precision firearm cartridge case includes a cylindrical body portion extending from a head end to a frusto-conical shoulder. The frusto-conical shoulder is integrally formed with the body portion and a tapered shoulder portion tapering from the body portion to a neck portion. The neck portion terminates in an open mouth at a projectile receiving end. The neck portion and the tapered portion extend longitudinally a distance such that a bullet positioned in the cartridge case extends through the neck portion and the tapered portion a distance no greater than to a plane through the frusto-conical shoulder so that cartridge case useable capacity is maximized.

1 . A long-range precision firearm cartridge case designed to maximizes cartridge case useable capacity comprising:
 a hollow cylinder includes a head end and a projectile receiving end, the cylinder including a generally cylindrical body portion extending from the head end to a frusto-conical shoulder, the body portion having a central aperture extending into the head end for receipt of a primer and a cartridge extraction groove formed around the periphery of the body portion adjacent the head end;   the frusto-conical shoulder is integrally formed with the body portion and a tapered shoulder portion tapering from the body portion to a generally cylindrical integrally formed neck portion, the neck portion extending longitudinally from the shoulder portion and having a diameter smaller than the diameter of the body portion and terminating in an open mouth at the projectile receiving end; and   the neck portion and the tapered portion extend longitudinally a distance such that a bullet positioned in the cartridge case extends through the neck portion and the tapered portion a distance no greater than to a plane through the frusto-conical shoulder, whereby cartridge case useable capacity is maximized.   
     
     
         2 . The long-range precision firearm cartridge case as claimed in  claim 1  wherein the neck portion and the tapered portion extend longitudinally a distance such that a bullet positioned in the cartridge case extends through the neck portion and the tapered portion approximately to the plane through the frusto-conical shoulder, whereby cartridge case useable capacity is maximized. 
     
     
         3 . The long-range precision firearm cartridge case as claimed in  claim 1  wherein the cartridge case useable capacity is increased by at least 7 gr. 
     
     
         4 . The long-range precision firearm cartridge case as claimed in  claim 1  wherein the overall size of the cartridge case is not substantially increased compared to prior art cartridge cases and cartridge case useable capacity is increased. 
     
     
         5 . The long-range precision firearm cartridge case as claimed in  claim 1  wherein a difference in position between a bullet and the cartridge case determines the difference in throats and bullet jump. 
     
     
         6 . A long-range precision firearm cartridge as claimed in  claim 5  wherein the difference results in the bullet or projectile being driven at 200 fps (feet per second) faster for any barrel length, whereby more down range energy and distance are produced. 
     
     
         7 . A long-range precision firearm cartridge case as claimed in  claim 1  including a firearm chamber reamer for use with the cartridge case. 
     
     
         8 . A long-range precision firearm cartridge comprising:
 a cartridge case including:
 a hollow cylinder includes a head end and a projectile receiving end, the cylinder including a generally cylindrical body portion extending from the head end to a frusto-conical shoulder, the body portion having a central aperture extending into the head end for receipt of a primer and a cartridge extraction groove formed around the periphery of the body portion adjacent the head end; 
 the frusto-conical shoulder is integrally formed with the body portion and a tapered shoulder portion tapering from the body portion to a generally cylindrical integrally formed neck portion, the neck portion extending longitudinally from the shoulder portion and having a diameter smaller than the diameter of the body portion and terminating in an open mouth at the projectile receiving end; and 
   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, the neck portion and the tapered portion of the cartridge case extending longitudinally a distance such that the projectile positioned in the cartridge case extends through the neck portion and the tapered portion a distance no greater than to a plane through the frusto-conical shoulder, whereby cartridge case useable capacity is maximized.   
     
     
         9 . The long-range precision firearm cartridge case as claimed in  claim 8  wherein the neck portion and the tapered portion extend longitudinally a distance such that the projectile positioned in the cartridge case extends through the neck portion and the tapered portion approximately to the plane through the frusto-conical shoulder, whereby cartridge case useable capacity is maximized. 
     
     
         10 . The long-range precision firearm cartridge case as claimed in  claim 8  wherein the combustible propellant in the body portion of the cartridge case is increased by at least 7 gr. 
     
     
         11 . The long-range precision firearm cartridge case as claimed in  claim 8  wherein the overall size of the cartridge case is not substantially increased compared to prior art cartridge cases and cartridge case useable capacity is increased. 
     
     
         12 . The long-range precision firearm cartridge case as claimed in  claim 8  wherein a difference in position between the projectile and the cartridge case over prior art projectiles and cartridge cases determines the difference in throat and bullet jump. 
     
     
         13 . A long-range precision firearm cartridge as claimed in  claim 12  wherein the difference results in the bullet or projectile being driven at 200 fps (feet per second) faster for any barrel length, whereby more down range energy and distance are produced. 
     
     
         14 . A long-range precision firearm cartridge as claimed in  claim 8  including a firearm chamber reamer for use with the cartridge case.