US12398985 - Firearm cartridge case

The patent describes a firearm cartridge case designed with a short action configuration, featuring a main body and neck portion connected by a frusto-conical shoulder to create a bottleneck shape. It specifies a length ratio between the cartridge case and the projectile that falls within a range of 3.5 to 0.9.

Claim 1

1. A firearm cartridge case, comprising: a short action cartridge case comprising a cartridge case main body portion and a cartridge case neck portion that are interconnected by a frusto-conical shoulder portion at an interface to form a bottleneck shape, a length L 1 of the cartridge case between a base of a rebated rim and the interface between the cartridge case main body portion and the frusto-conical shoulder portion, a ratio of the length L 1 of the cartridge case and a length of a projectile receivable within the cartridge case neck portion is between 3.5-0.9. a short action cartridge case comprising a cartridge case main body portion and a cartridge case neck portion that are interconnected by a frusto-conical shoulder portion at an interface to form a bottleneck shape, a length L 1 of the cartridge case between a base of a rebated rim and the interface between the cartridge case main body portion and the frusto-conical shoulder portion, a ratio of the length L 1 of the cartridge case and a length of a projectile receivable within the cartridge case neck portion is between 3.5-0.9.

Google Patents

https://patents.google.com/patent/US12398985

USPTO PDF

https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/12398985