Firearm cartridge case
View Patent ↗A firearm cartridge case includes 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 to form a bottleneck shape, a length L 1 of the cartridge case between a base of a rebated rim and an 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.
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.
2. The firearm cartridge case as recited in claim 1 , wherein the projectile is a 22 caliber projectile having a projectile length of 0.550-1.260 inches.
3. The firearm cartridge case as recited in claim 2 , wherein the ratio of the length L 1 of the cartridge case and the length of the projectile is between 3.3-1.4.
4. The firearm cartridge case as recited in claim 1 , wherein the projectile is a 24 caliber projectile having a projectile length of 0.685-1.502 inches.
5. The firearm cartridge case as recited in claim 4 , wherein the ratio of the length L 1 of the cartridge case and the length of the projectile is between 2.6-1.2.
6. The firearm cartridge case as recited in claim 1 , wherein the projectile is a 25 caliber projectile having a projectile length of 0.505-1.416 inches.
7. The firearm cartridge case as recited in claim 6 , wherein the ratio of the length L 1 of the cartridge case and the length of the projectile is between 3.5-1.3.
8. The firearm cartridge case as recited in claim 1 , wherein the projectile is a 26 caliber projectile having a projectile length of 0.828-1.530 inches.
9. The firearm cartridge case as recited in claim 8 , wherein the ratio of the length L 1 of the cartridge case and the length of the projectile is between 2.1-1.1.
10. The firearm cartridge case as recited in claim 1 , wherein the projectile is a 27 caliber projectile having a projectile length of 0.985-1.490 inches.
11. The firearm cartridge case as recited in claim 10 , wherein the ratio of the length L 1 of the cartridge case and the length of the projectile is between 1.8-1.2.
12. The firearm cartridge case as recited in claim 1 , wherein the projectile is a 28 caliber projectile having a projectile length of 0.870-1.692 inches.
13. The firearm cartridge case as recited in claim 12 , wherein the ratio of the length L 1 of the cartridge case and the length of the projectile is between 2.0-1.0.
14. The firearm cartridge case as recited in claim 1 , wherein the projectile is a 30 caliber projectile having a projectile length of 0.614-1.876 inches.
15. The firearm cartridge case as recited in claim 14 , wherein the ratio of the length L 1 of the cartridge case and the length of the projectile is between 2.8-0.9.
16. A firearm cartridge, 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 rebated rim which defines a cartridge case rim diameter less than a cartridge case diameter, 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; and
a projectile at least partially within a mouth of the cartridge case neck portion to form a cartridge overall length that is less than 3.0 inches, wherein a ratio of the length L 1 of the cartridge case and a length of the projectile receivable within the cartridge case neck portion is between 3.5-0.9.
17. The firearm cartridge as recited in claim 16 , wherein a ratio of the cartridge case main body portion diameter to the cartridge case rim diameter is between 1.03-1.10, and a ratio of an overall short action cartridge case length and the cartridge case main body portion diameter is 3.8-4.2.
18. The firearm cartridge as recited in claim 17 , wherein the projectile has a projectile length of 0.550-1.876 inches.
19. The firearm cartridge case as recited in claim 18 , wherein the main body portion extends forward from an extractor grove to the frusto-conical shoulder.
20. The firearm cartridge case as recited in claim 19 , wherein the cartridge case main body portion diameter is 0.497 inches measured at a location which is 0.150 inches from the base.
21. The firearm cartridge case as recited in claim 20 , wherein the cartridge case main body portion diameter is 0.497 inches measured at a location which is 0.150 inches from the base and the rim diameter is 0.471 inches.
22. The firearm cartridge case as recited in claim 21 , wherein the short action cartridge case is 1.92 to 2.10 inches in length.
23. The firearm cartridge case as recited in claim 16 , wherein a ratio of the cartridge case main body portion diameter to the cartridge case rim diameter is between 1.03-1.10.
24. The firearm cartridge case as recited in claim 16 , wherein a length of the cartridge case between a base and an interface between the frusto-conical shoulder portion and the cartridge case neck portion is 1.770 inches and the length of the cartridge case between the base and an interface between the frusto-conical shoulder portion and the cartridge case main body portion is 1.602 inches.
25. The firearm cartridge case as recited in claim 24 , wherein an angle defined by the frusto-conical shoulder portion is 30 degrees.