Monolithic bullet projectile for rifle firearms and method of making same

Abstract

The invention comprises a monolithic bullet projectile for rifle firearms (FIG. 1 ), having cylindrical profile of front guiding section (CP) of a diameter which is lower than or equal to a diameter of lands (øP) of the rifled bore of the firearm barrel, with specific short head (CG) of half-circle or cone shape, and a method of making same. It is characterized in that the centre of gravity (SC) is situated in the front, cylindrical guiding section of the bullet, and the back trailing section (CW), situated behind the centre of gravity (SC) of the whole bullet, has radial profiling comprising the relieving grooves (RO) of a diameter lower than a diameter of lands (øP) of the rifled bore of the firearm barrel and the trailing rings (PW) of a diameter which is equal to or lower than a diameter of the rifles (øB) of the rifled bore of the firearm barrel, situated in the following order: trailing ring-relieving groove-trailing ring or multiplication of that configuration, so that the total number of the trailing rings (PW) of the bullet is always twice as high as the number of relieving grooves (RO) of the bullet. A method of making the bullet according to the invention is characterized in that the guiding section of the bullet (CP) is calibrated independently up to a diameter which is lower than or equal to a diameter of lands (øP) of the rifled bore of the barrel, and the radial profiling of the trailing section of the bullet (CW), comprising the relieving grooves (RO) and trailing rings (PW), is made in a single technological operation, applying for the making of trailing rings (PW) the effect of upsetting of the homogeneous material of the bullet along the edge of the radial relieving groove (RO) while the trailing section of the bullet (CW) is calibrated independently up to a diameter which is lower than or equal to a diameter of the rifles (øB) of the rifled bore of the barrel.

What is claimed is: 
     
         1 . A monolithic bullet projectile for rifle firearms, having cylindrical profile of front guiding section (CP) of a diameter which is lower than or equal to a diameter of lands (øP) of the rifled bore of the firearm barrel, with specific short head (CG) shaped as a spherical cap, a hemisphere, a truncated hemisphere, a cone, a truncated cone or a flat, wherein the centre of gravity (SC) of the bullet is situated in the cylindrical front guiding section of the bullet. 
     
     
         2 . A monolithic bullet projectile according to  claim 1 , wherein the back trailing section (CW), situated behind the centre of gravity (SC) of the whole bullet, has radial profiling comprising the relieving grooves (RO) of a diameter lower than a diameter of lands (øP) of the rifled bore of the firearm barrel and the trailing rings (PW) of a diameter which is equal to or lower than a diameter of the rifles (øB) of the rifled bore of the firearm barrel, situated in the following order: trailing ring-relieving groove-trailing ring or multiplication of that configuration, so that the total number of the trailing rings (PW) of the bullet is always twice as high as the number of relieving grooves (RO) of the bullet. 
     
     
         3 . A method of making a monolithic bullet projectile for rifled firearms, made of copper or copper alloys, wherein radial profiling of the trailing section of the bullet (CW) comprising the relieving grooves (RO) and trailing rings (PW), situated in the following order: trailing ring-relieving groove-trailing ring or multiplication of that configuration, is made in a single technological operation, applying for the making of trailing rings the effect of upsetting of the homogeneous material of the bullet ( 2 ) along the edge of the radial relieving groove, using a cutting roll or a set of cutting rolls ( 7 ) acting together with cylindrical rolls ( 8 ) supporting the bullet material. 
     
     
         4 . A method according to  claim 3 , wherein the guiding section of the bullet (CP) is calibrated independently up to a diameter which is lower than or equal to a diameter of lands (øP) of the rifled bore of the barrel, and the trailing section of the bullet (CW) is calibrated independently up to a diameter which is lower than or equal to a diameter of rifles (øB) of the rifled bore of the barrel.