Firearm cartridge case

1. A firearm cartridge case, comprising:

a short action cartridge case comprises 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; and

a rebated rim which defines a cartridge case rim diameter less than the cartridge case main body portion diameter, a ratio of the cartridge case main body portion diameter to the rim diameter is between 1.03-1.10.

2. The firearm cartridge case as recited in claim 1 , wherein a ratio of the cartridge case main body portion diameter to the rim diameter is 1.06.

3. The firearm cartridge case as recited in claim 1 , wherein the cartridge case main body portion diameter is 0.497 inches measured at a location which is 0.150 inches from the base.

4. The firearm cartridge case as recited in claim 1 , wherein the rim diameter is 0.471 inches.

5. The firearm cartridge case as recited in claim 1 , 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.

6. The firearm cartridge case as recited in claim 1 , wherein the cartridge case is 1.92 to 2.10 inches in length.

7. The firearm cartridge case as recited in claim 1 , wherein a ratio of the overall case length and the cartridge case main body portion diameter is 3.8-4.2.

8. The firearm cartridge case as recited in claim 1 , wherein a ratio of the overall case length and the cartridge case main body portion diameter is 4.0.

9. The firearm cartridge case as recited in claim 1 , further comprising a small primer pocket within the base of the cartridge case.

10. The firearm cartridge case as recited in claim 1 , wherein the cartridge case has a capacity to contain 45-55 grains of gun powder within the cartridge case.

11. 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 to form a bottleneck shape, a rebated rim which defines a cartridge case rim diameter less than a cartridge case diameter, 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;

45-55 grains of gun powder within the short action cartridge case;

a small rifle primer within a primer pocket formed in the cartridge case; 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 2.8 inches, wherein the projectile is between 0.22-0.30 caliber.

12. The firearm cartridge case as recited in claim 11 , wherein a ratio of the cartridge case main body portion diameter to the rim diameter is 1.06.

13. The firearm cartridge case as recited in claim 12 , wherein a ratio of the overall case length and the cartridge case main body portion diameter is 4.0.

14. The firearm cartridge case as recited in claim 12 , 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.

15. The firearm cartridge case as recited in claim 1 , wherein the cartridge case is 2.035 inches in length.

16. The firearm cartridge case as recited in claim 1 , wherein a 0.420 headspace gauge is at 1.656+/−0.003 inches for the cartridge case.

17. The firearm cartridge case as recited in claim 1 , wherein the main body portion extends forward from an extractor grove to the frusto-conical shoulder.

18. The firearm cartridge case as recited in claim 17 , wherein the cartridge case main body portion diameter is 0.497 inches measured at a location which is 0.150 inches from the base.

19. The firearm cartridge case as recited in claim 17 , 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.

20. The firearm cartridge case as recited in claim 19 , wherein the short action cartridge case is 1.92 to 2.10 inches in length.

21. The firearm cartridge case as recited in claim 1 , wherein a ratio of the cartridge case main body portion diameter to the cartridge case rim diameter is between 1.03-1.10.

22. The firearm cartridge case as recited in claim 1 , 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.

23. The firearm cartridge case as recited in claim 22 , wherein an angle defined by the frusto-conical shoulder portion is 30 degrees.

24. A firearm cartridge case, comprising:

a short action cartridge case comprises 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; and

a rebated rim which defines a cartridge case rim diameter that is 0.471 inches, wherein the cartridge case main body portion diameter is 0.497 inches measured at a location which is 0.150 inches from the base, a length of the cartridge case between the 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, 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.