Abstract A projectile for a centerfire cartridge that achieves maximum energy transfer with limited target penetration when fired from snub-nosed pistols. A hollow point lead bullet is provided with an aluminum jacket of sufficient hardness to avoid fouling the pistol barrel and which allows the cartridge containing the projectile to feed reliably in auto-loading pistols and yet does not restrict normal expansion of the bullet upon impact with the target. The jacket extends into the nose recess of the bullet and covers the peripheral portion of the bullet base, whereby the jacket is securely fastened to the bullet and separation subsequent to impact is prevented. The jacket is uniformly notched at the nosetip annulus to weaken the aluminum jacket and promote upset at surprisingly low impact velocities. A method of fabricating the projectile is also disclosed in which a cup-shaped aluminum jacket is partially filled with a lead core and simultaneously the cup base is notched before being formed into a hollow point bullet nose configuration. The notches can thus be uniformly controlled in contrast to slitting or cutting before or after forming in which the sharpness and force applied to the cutting knife governs the size of the slit or cut in a hard to control fashion.
Inventors
👤 Henry J. Halverson
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-11-05 23:56
CPC Classifications
F; F42; F42B; F42B12/00; F42B12/02; F42B12/34
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
175 words
A method of uniformly notching an upsetting non-fragmenting jacketed hollow point projectile for pistol ammunition which method comprises the steps of: (a) inserting a lead core forwardly into a rearwardly opening cuplike aluminum jacket to form a jacketed core having a longitudinal axis; (b) forming said jacketed core into a projectile preform having the base of said jacket cup facing forward and forming a flat circular frontal area on said projectile preform the frontal area being orthogonal to the longitudial axis; (c) simultaneously with said preforming step, uniformly notching but not splitting said flat front of said preform while leaving the ogive of said preform unnotched; (d) axially recessing the nose of said jacketed preform to produce a hollow point cavity; and (c) forming said notched preform into a final projectile by reducing the flat front of said notched preform so that said notches extend from the ogive, pass over an annular nose rim of said projectile and terminate in said cavity, whereby to produce a bullet which uniformly upsets without fragmentation upon target impact.
Claim 2
Independent Claim
175 words
A method of uniformly notching an upsetting non-fragmenting jacketed hollow point projectile for pistol ammunition which method comprises the steps of: (a) inserting a lead core forwardly into a rearwardly opening cuplike aluminum jacket to form a jacketed core having a longitudinal axis; (b) forming said jacketed core into a projectile preform having the base of said jacket cup facing forward and forming a flat circular frontal area on said projectile preform the frontal area being orthogonal to the longitudial axis; (c) simultaneously with said preforming step, uniformly notching but not splitting said flat front of said preform while leaving the ogive of said preform unnotched; (d) axially recessing the nose of said jacketed preform to produce a hollow point cavity; and (c) forming said notched preform into a final projectile by reducing the flat front of said notched preform so that said notches extend from the ogive, pass over an annular nose rim of said projectile and terminate in said cavity, whereby to produce a bullet which uniformly upsets without fragmentation upon target impact.