Jul 14, 2026

US12680795 - Cartridge of a firearm, cartridge chamber, combination consisting of a lock and cartridge chamber of such a cartridge, and firearm

The invention relates to a cartridge of a firearm, comprising a cartridge case implemented in the manner of a bottleneck case for receiving a projectile, wherein the cartridge case has an overall length (L 3 ) of 37.50 mm (1.4764″) to 40.50 mm (1.5945″), preferably of 38.50 mm (1.5157″) to 39.50 mm (1.5551″), particularly preferably of 39.00 mm (1.5354″), and the length of the case neck—case neck length (L 3 -L 2 )—is selected such that the ratio of the diameter (G 1 ) of the projectile ( 8 ) to the case neck length (L 3 -L 2 ) of the cartridge case is between 1.19 and 1.36, preferably between 1.26 and 1.36, and particularly preferably between 1.26 and 1.27. The invention further relates to a cartridge chamber, to a combination of breech and cartridge chamber of such a firearm, and to a firearm.

Assignee: ATC Performance GmbH
Inventors: Robert Zapf
Filing date: 2022-10-14

firearmcartridgeammunition

The patent describes a bottleneck cartridge designed for firearms, featuring specific dimensions for the cartridge case and a defined ratio between the projectile diameter and case neck length to enhance performance. Additionally, it includes details about the cartridge chamber and the integration of the breech with the cartridge chamber, emphasizing the cartridge’s capability for unilateral backward operation in weapon systems.

Claim 1

1 . A cartridge of a firearm comprising a cartridge case implemented in the manner of a bottleneck cartridge case for receiving a projectile, wherein the cartridge case has an overall length of 38.50 mm (1.5157″) to 40.50 mm (1.5945″), wherein the length from the bottom to the transition from a shoulder cone to case neck is 32.29 mm (1.2713″) to 33.29 mm (1.3106″), wherein the length of the case neck is selected such that the ratio of the diameter of the projectile to the case neck length of the cartridge case is between 1.26 and 1.36, and wherein the shoulder cone connects to the case neck and transitions into the case body of the cartridge case, wherein the case body connects to an extractor groove of the cartridge at the case bottom and has a conical taper from the extractor groove toward the shoulder cone, such that the case body has a diameter of 10.07 mm (0.3965″) to 11.350 mm (0.4469″) at the connection to the shoulder cone, and wherein the cartridge, when employed in weapons systems, demonstrates unilateral backward capability. wherein the length of the case neck is selected such that the ratio of the diameter of the projectile to the case neck length of the cartridge case is between 1.26 and 1.36, and wherein the shoulder cone connects to the case neck and transitions into the case body of the cartridge case, wherein the case body connects to an extractor groove of the cartridge at the case bottom and has a conical taper from the extractor groove toward the shoulder cone, such that the case body has a diameter of 10.07 mm (0.3965″) to 11.350 mm (0.4469″) at the connection to the shoulder cone, and wherein the cartridge, when employed in weapons systems, demonstrates unilateral backward capability.

Google Patents

https://patents.google.com/patent/US12680795

USPTO PDF

https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/12680795