Rifle bullet for hunting purposes

• US 20070006770A1
• Filed: 06/09/2005
• Published: 01/11/2007
• Est. Priority Date: 12/09/2002
• Status: Active Grant

• Current Assignee: Wilhelm Brenneke GmbH & Company KG
• Original Assignee: Wilhelm Brenneke GmbH & Company KG
• Inventors: Herrlinger, Klaus
• Granted Patent: US 7,543,535 B2
• Time in Patent Office: Days
• US Class Current: 102/516
• CPC Class Codes: F42B 12/78 of jackets for smallarm bullets ; Jacketed bullets or projectiles

Abstract

Rifle bullet for hunting purposes, with a jacket of a lead-free soft ductile material and a core, connected to the jacket, made from a material softer than the jacket. The aim of the invention is to improve the bullet to provide a persistent cut of hair and bleeding at the point of entry, mushrooming in a controlled manner with considerable cross-sectional enlargement, whilst only marginally breaking up with a high residual weight (90% and more). The rifle bullet has a thinly-jacketed bullet tip and has a marked sharp edge at the transition point of the jacket on the bullet tip to a substantially thicker-jacketed tail section. The rifle bullet is internally provided with a circumferential channel reducing the wall thickness of the jacket at said point, filled with the core material.

Claims

1. Bullet for a hunting rifle, comprising:

a) a jacket made of a lead-free, ductile material, such as red brass, copper or brass;

b) a core physically connected to the jacket and made of a material softer than that of the jacket, such as lead, a lead-tin alloy, or a lead-free bismuth alloy;

c) a thinly jacketed bullet head; and

d) at a portion of the jacket where the bullet head meets the significantly thicker-walled tail section the rifle bullet includes both a prominent sharp edge and, inwardly thereof, a circumferential groove reducing the wall thickness of the jacket and filled with the material of the core.

2. Rifle bullet as claimed in claim 1, wherein:

a) the middle region of the thickly-jacketed tail section features a circumferentially running cannelure on the outside of the jacket.

3. Rifle bullet as claimed in claim 2, wherein:

a) the wall thickness of the jacket is gradually increased in the region between the groove and the cannelure.

4. Rifle bullet as claimed in claim 3, wherein:

a) the outer diameter in the region between a base and the cannelure is equal to a barrel caliber; and

b) the outer diameter of the region between the cannelure and the sharp edge is gently tapered to prevent the sharp edge from engaging rifling of a rifle barrel.

5. Rifle bullet as claimed in claim 4, wherein:

a) the wall thickness of the base is significantly greater than that of the jacket in the tail section.

6. Rifle bullet as claimed in claim 4, wherein:

a) the base is cone-shaped.

7. Bullet for a hunting rifle, comprising:

a) a jacket made of a lead-free, ductile material;

b) a core physically connected to the jacket and made of a material softer than that of the jacket;

c) a thinly jacketed bullet head; and

d) at a portion of the jacket where the bullet head meets the significantly thicker-walled tail section the rifle bullet includes both a prominent sharp edge and, inwardly thereof, a circumferential groove reducing the wall thickness of the jacket and filled with the material of the core.

8. Rifle bullet as claimed in claim 7, wherein:

a) a middle region of the thickly-jacketed tail section features a circumferentially running cannelure on the outside of the jacket.

9. Rifle bullet as claimed in claim 8, wherein:

a) the wall thickness of the jacket is gradually increased in the region between the groove and the cannelure.

10. Rifle bullet as claimed in claim 9, wherein:

a) the outer diameter in the region between a base and the cannelure is equal to a barrel caliber; and

b) the outer diameter of the region between the cannelure and the sharp edge is gently tapered to prevent the sharp edge from engaging rifling of a rifle barrel.

11. Rifle bullet as claimed in claim 10, wherein:

a) the wall thickness of the base is significantly greater than that of the jacket in the tail section.

12. Rifle bullet as claimed in claim 11, wherein:

a) the base is cone-shaped.

13. Rifle bullet as in claim 7, wherein:

a) the lead-free, ductile material includes one of red brass, copper, and brass; and

b) the material of the core includes one of lead, a lead-tin alloy, or a lead-free bismuth alloy.

14. Rifle bullet as in claim 7, wherein:

a) the lead-free, ductile material includes one of red brass, copper, and brass; and

b) the material of the core includes a lead-free bismuth alloy.