Rifle cartridge with bullet having resilient pointed tip

• US 20060278117A1
• Filed: 05/16/2005
• Published: 12/14/2006
• 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 7,380,502 B2
• Time in Patent Office: Days
• US Class Current: 102/519
• 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 firearm cartridge with a bullet including a body and a nose element. The body has a forward end, and an opposed rear end, with an intermediate cylindrical portion between the ends. The front end of the body defines a cavity that may have a cylindrical shape. The nose element is formed of a resilient material such as an elastomer, and has a first portion received in the cavity, and a pointed second portion extending from the forward end of the body. The bullet may be received in a centerfire rifle casing, for safe use in a tubular magazine rifle, so that the resilient tip protects against discharge of an adjacent cartridge primer by absorbing energy of recoil or other impulse. The second portion of the tip has a small meplat, and is smoothly contoured with the exterior surface of the front of the bullet, to provide an increased ballistic coefficient.

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 pointed nose element having a first portion received in the cavity; and

the nose element having a second portion extending from the forward end of the body.

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

3. The component of claim 1 wherein the nose element has a Shore-A hardness of at least 60.

4. The component of claim 1 wherein the nose element has a Shore-A hardness of at most 95.

5. The component of claim 1 wherein the cavity is a cylindrical bore.

6. The component of claim 1 wherein the second portion of the nose element is tapered.

7. The component of claim 1 wherein the second portion of the nose element includes an ogive portion abutting the forward end of the body, and a meplat portion forming a tip.

8. The component of claim 7 wherein the ogive has an ogive radius of curvature, the meplat has a meplat radius of curvature, and the ogive radius of curvature is greater than the meplat radius of curvature.

9. The component of claim 7 wherein the ogive has a first diameter at an ogive rear portion adjacent to the body, and a lesser second diameter adjacent to the meplat.

10. The component of claim 7 wherein the nose element defines an axis, and wherein the ogive portion has a first radius of curvature along the axis, and a lesser second radius of curvature across the axis.

11. The component of claim 1 wherein a forward portion of the body has a tapered surface portion, and wherein the second portion of the nose element has an external surface portion extending smoothly from the tapered surface portion.

12. The component of claim 11 wherein the tapered surface portion of the body and the external surface portion of the nose element have a common ogive radius.

13. 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 1 wherein the body includes a lead core surrounded by a copper jacket, and wherein the copper jacket has a forward aperture extending to the second portion of the nose element and closely receiving a forward portion of the first portion of the nose element.

15. 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;

an elastomeric nose element having a first portion received in the cavity; and

the nose element having a second portion extending from the forward end of the body.

16. The ammunition component of claim 15 wherein the second portion of the nose element has a pointed shape.

17. A firearm cartridge comprising:

a case defining an interior volume containing gunpowder, having a rear end defining a central primer pocket receiving a primer, and defining a case mouth at a forward end opposite the rear end;

a bullet received in the body;

the bullet having a tapered forward portion extending from the case;

at least a first portion of the forward portion comprising a resilient nose element received in the body

18. The cartridge of claim 17 wherein the nose element has tip having a limited first radius, and wherein the bullet includes a body receiving the tip, the nose element having a surface portion adjacent to the body and away from the tip, the surface portion having a second radius greater than the first radius.

19. The cartridge of claim 17 wherein the nose element is an elastomer.

20. The cartridge of claim 17 wherein a portion of the nose element has an external surface portion adjacent to and extending smoothly from the forward portion of the bullet.