SMALL ARMS CARTRIDGE

• US 20200132421A1
• Filed: 10/29/2018
• Published: 04/30/2020
• Est. Priority Date: 10/29/2018
• Status: Abandoned Application

• Current Assignee: Lightforce USA, Inc.
• Original Assignee: Lightforce USA, Inc.
• Inventors: Summerfield, Abram W., Boyd, Pietro, Wisdom, Kristofer, Dennis, Raymond L.
• Application Number:
  US16/173,369
• Publication Number:
  US 20200132421A1
• Time in Patent Office: Days
• CPC Class Codes: F42B 10/38 Range-increasing arrangements F42B10/34, F42B14/06 and F42B15/105 take precedence
• CPC Class Codes: F42B 5/02 Cartridges, i.e. cases with charge and missile
• CPC Class Codes: F42B 5/025 characterised by the dimension of the case or the missile
• CPC Class Codes: F42B 5/26 Cartridge cases F42B5/18 takes precedence ; manufacturing of cartridge cases B21K21/04

Abstract

Provided is a centerfire rifle cartridge. A case has a head end, an open mouth end for receiving a projectile, and a central axis. The head end has a base portion substantially conforming to that of a .50 BMG cartridge. The case has a case wall with a taper of up to 1.0° relative to the central axis. A frusto-conical shoulder portion extends from the case wall and has an angle of approximately 40° relative to the central axis. A neck portion extends from the shoulder portion and has a mouth sized to receive a .375 caliber (9.5 mm) projectile.

Claims

1. A centerfire rifle cartridge, comprising:

a case having a head end, an open mouth end for receiving a projectile, a central axis, and an axial length measured along the central axis, the head end having a base portion up to 0.804 inches in diameter;

the case having a case wall, the case wall having a taper of 0.85°

to 1.0°

relative to the central axis, a frusto-conical shoulder portion extending from the case wall and having an angle of 35°

to 45°

relative to the central axis, and a neck portion extending from the shoulder portion; and

the neck portion having a mouth sized to receive a .375 caliber projectile.

2. The cartridge of claim 1, wherein the case has a total axial length in the range of about 3.24 inches to about 3.29 inches.

3. The cartridge of claim 1, wherein the wall has an axial length from the head end of about 2.50 inches.

4. The cartridge of claim 1, wherein the case wall taper is about 0.9°

relative to the central axis.

5. The cartridge of claim 1, wherein the case capacity is greater than 200 grains H₂O.

6. The cartridge of claim 5, wherein the case has a capacity in the range of about 210-230 grains H₂O.

7. The cartridge of claim 1, further comprising a projectile having a weight in the range of about 350-410 grains

8. The cartridge of claim 7, wherein the loaded overall length is at least 4.65 inches.

9. The cartridge of claim 8, wherein the loaded overall length is about 4.825 inches.