Bullet
First Claim
Patent Images
1. A controlled expansion bullet for mounting in the hollow end of a cartridge, said bullet having a solid cylindrical base and a hollow ogive shaped nose, a soft core in the hollow nose and thermally bonded to the hollow nose, said cylindrical base portion comprising:
- a base shank portion comprising a single forward shank region G2 and a single terminal shank region G1 both dimensioned cross-sectionally to engage and be compressed by lands within a gun barrel and wherein G2 exceeds G1 in longitudinal length and is dimensioned to accommodate attachment to a shell case, and a single circumferential friction reduction band (FRB) located between G1 and G2 and having a diameter less than the lands and of sufficient longitudinal length to reduce the total length of the base shank portion (G1+G2+FRB) which contacts the lands by about 41-65%;
a tapered weighted region extending from the terminal shank region to provide additional weight without contacting said lands; and
a tapered nose portion extending from the forward shank region having a blunt forward end leading to the soft core for controlled expansion of the bullet upon firing, wherein the improvements together result in an increased muzzle velocity of approximately 7% and in increased kinetic energy of about 14% for a given pressure compared to a bullet without the FRB at the given pressure.
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Accused Products
Abstract
The invention relates to a bullet having a tapered nose and a cylindrical base. The base is provided with an annular groove having a diameter less than the bore diameter of the barrel of the gun from which it is fired to reduce the force required to move the bullet through the barrel to increase the muzzle velocity and kinetic energy of the bullet.
65 Citations
11 Claims
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1. A controlled expansion bullet for mounting in the hollow end of a cartridge, said bullet having a solid cylindrical base and a hollow ogive shaped nose, a soft core in the hollow nose and thermally bonded to the hollow nose, said cylindrical base portion comprising:
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a base shank portion comprising a single forward shank region G2 and a single terminal shank region G1 both dimensioned cross-sectionally to engage and be compressed by lands within a gun barrel and wherein G2 exceeds G1 in longitudinal length and is dimensioned to accommodate attachment to a shell case, and a single circumferential friction reduction band (FRB) located between G1 and G2 and having a diameter less than the lands and of sufficient longitudinal length to reduce the total length of the base shank portion (G1+G2+FRB) which contacts the lands by about 41-65%;
a tapered weighted region extending from the terminal shank region to provide additional weight without contacting said lands; and
a tapered nose portion extending from the forward shank region having a blunt forward end leading to the soft core for controlled expansion of the bullet upon firing, wherein the improvements together result in an increased muzzle velocity of approximately 7% and in increased kinetic energy of about 14% for a given pressure compared to a bullet without the FRB at the given pressure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification