Patent ID: 6439125
Filing Date: 2002-08-27
Classification: F42B

Abstract:
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.