Nov 4, 2025

US12460909 - Polymer jacked solid core projectile

Provided is a polymer jacketed projectile with metal core. The projectile includes a metal bullet core and a monolithic polymer bullet jacket surrounding a portion of the bullet core. The jacket includes a series of radial driving bands cut into the jacket in a graduated configuration at increasing thicknesses. The graduation and increasing thickness of the driving bands allows gradual radial acceleration upon engraving of the rifling due to intentional radial deformation of the forward driving bands. Additionally, the bullet core) includes high-friction surfaces formed in a longitudinal direction or at a base of the bullet core. The modified surface increases friction between the bullet core and polymer, further decreasing radial slippage.

Inventors: Michael R. Harris, David P. Armstrong, Joseph T. Burkart, Lucius A Taylor, IV
Filing date: 2024-02-29

projectileammunitionpolymermetal

The patent describes a polymer jacketed projectile featuring a metal core and a jacket with graduated radial driving bands that enhance performance by allowing gradual radial acceleration during firing. Additionally, the bullet core is designed with high-friction surfaces to minimize slippage between the core and the jacket, improving stability and accuracy.

Claim 1

1 . A firearm projectile comprising: a bullet core comprising a high-friction surface formed from nose to tail in a longitudinal direction or at a base of said bullet core; and a monolithic polymer bullet jacket surrounding a portion of said bullet core and comprising a series of radial driving bands cut into said jacket in a graduated configuration at progressively increasing width from nose to tail. a bullet core comprising a high-friction surface formed from nose to tail in a longitudinal direction or at a base of said bullet core; and a monolithic polymer bullet jacket surrounding a portion of said bullet core and comprising a series of radial driving bands cut into said jacket in a graduated configuration at progressively increasing width from nose to tail.

Google Patents

https://patents.google.com/patent/US12460909

USPTO PDF

https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/12460909