CARTRIDGE AND BULLET WITH CONTROLLED EXPANSION

• US 20120085258A1
• Filed: 06/03/2008
• Published: 04/12/2012
• Est. Priority Date: 05/16/2005
• Status: Active Grant

• Current Assignee: Hornady Manufacturing Company
• Original Assignee: Hornady Manufacturing Company
• Inventors: Emary, David E.
• Granted Patent: US 8,161,885 B1
• Time in Patent Office: Days
• US Class Current: 102/439
• CPC Class Codes: F42B 12/20 of high-explosive type F42B12/44 takes precedence
• CPC Class Codes: F42B 12/34 expanding before or on impact, i.e. of dumdum or mushroom type
• CPC Class Codes: F42B 30/02 Bullets

Abstract

A bullet or a cartridge containing a bullet having an elongated body with a forward end and an opposed rear end. The body has an intermediate cylindrical portion between the rear and forward ends, and the front end of the body defines a cavity. A resilient nose element is received in the cavity. The nose element may be an elastomer, and may be a cylindrical body. The cavity may be a cylindrical bore, and the nose element may be closely encompassed within the bore. The forward end of the nose element may be flat, and may be flush with the forward end of the body.

Claims

1. A firearm ammunition component comprising:

an elongated body;

the body having a forward end;

the body having a rear end opposite the forward end;

the body having an intermediate cylindrical portion between the rear and forward ends;

the front end of the body defining a cavity;

a resilient nose element, at least a portion of which is received in the cavity;

wherein the nose element is a cylindrical body; and

wherein the nose element has a flat forward end.

2. The component of claim 1 wherein the cavity is cylindrical.

4. The component of claim 1 wherein the nose element has a blunt forward end.

6. The component of claim 1 wherein the nose element substantially fills the cavity.

7. The component of claim 1 wherein substantially the entire nose element is received within the cavity when the bullet is in an unfired state.

8. The component of claim 1 wherein the nose element has a forward end substantially flush with the front end of the body.

9. The component of claim 1 wherein the cavity is an elongated cylindrical shape.

10. The component of claim 1 wherein the body includes a lead alloy core and a copper alloy jacket encompassing the core, and wherein copper jacket defines a forward open end encompassing the nose element.

11. The component of claim 1 wherein the nose element is an elastomer.

12. The component of claim 1 including a case defining an interior volume containing gunpowder, and defining a case mouth receiving the body.

14. The component of claim 2 wherein the cavity has a flat, circular floor.

15. The component of claim 1, wherein the cavity has a constant cross-section.

16. The component of claim 1, wherein the nose element has a forward end flush with the front end of the body.

3. (canceled)

5. (canceled)

13. A firearm ammunition component comprising:

an elongated body;

the body having a forward end;

the body having a rear end opposite the forward end;

the body having an intermediate cylindrical portion between the rear and forward ends;

the front end of the body defining a cavity;

a resilient nose element, at least a portion of which is received in the cavity;

wherein the nose element is a cylindrical body; and

wherein the nose element is an elongated body having opposed ends, and wherein the body of the nose element is end-to-end symmetrical such that orientation is not critical for manufacturing.

17. A firearm ammunition component comprising:

an elongated body;

the body having a forward end;

the body having a rear end opposite the forward end;

the body having an intermediate cylindrical portion between the rear and forward ends;

the front end of the body defining a cavity;

a resilient nose element, at least a portion of which is received in the cavity; and

wherein the nose element is an elastomer having a Shore A hardness less than or equal to 80.

18. The component of claim 17, wherein the nose element is an elastomer having a Shore A hardness greater than or equal to 50.

19. The component of claim 17, wherein the body has a sectional density greater than or equal to 0.100 and less than 0.200.

20. The component of claim 17, wherein the body has a caliber and the nose element is an elastomer having a Shore A hardness that is less than or equal to 1/100 of an X-axis velocity function for the caliber of the body and greater than or equal to 1/500 of the X-axis velocity function for the caliber of the body.

21. The component of claim 17, wherein the nose element has an exposed front face that is molded with an identifying indicia.

22. The component of claim 17, wherein the body has a caliber selected from the group consisting of 380 ACP, 45 ACP, and 38 Special.

23. The component of claim 17, wherein the cavity has a length to diameter ratio of at least 1.5 and the nose element has a length to diameter ratio of at least 1.5.