Claims
- 1. A method for manufacturing a bullet comprising:
providing a jacket precursor; providing a pellet first core precursor; inserting the pellet into the jacket precursor; providing a second core precursor; inserting the second core precursor into the jacket precursor aft of the pellet; pressing the second core precursor against the pellet so as to deform the pellet to fill a frontal volume of the jacket precursor as a first core, with relatively less deformation of the second core precursor; and deforming an aft portion of the jacket precursor to contain the second core precursor as a second core.
- 2. The method of claim 1 wherein:
a forward half of the jacket precursor is already in a substantially final shape prior to insertion of the pellet.
- 3. The method of claim 1 wherein:
said pressing comprises at least two stages, a first relatively low force/pressure stage deforming the pellet to substantially fill said frontal volume and a second relatively high force/pressure stage deforming the second core precursor to laterally expand to fill an aft volume of the jacket precursor.
- 4. The method of claim 1 wherein:
the second core precursor is provided having a convex front surface and a lateral surface which is cylindrical along a majority of a length of the second core precursor.
- 5. The method of claim 1 wherein:
the second core precursor is provided having essentially a convex front surface, a cylindrical lateral surface, and a convex rear surface.
- 6. The method of claim 1 wherein:
the pellet has a density less than 30% of a density of the second core.
- 7. The method of claim 1 wherein the pellet is provided as a sphere.
- 8. The method of claim 7 wherein the second core precursor is provided as a circular cylinder.
- 9. The method of claim 1 wherein the first and second cores abut.
- 10. The method of claim 1 wherein the first core is essentially pure tin having a tin content of at least 99.85%, by weight, a yield strength of 11.0 MPa or less and a hardness of from about 3 to about 5 HB.
- 11. The method of claim 10 wherein the second core is essentially pure copper.
- 12. The method of claim 10 wherein the second core is essentially a polymer filled with a tungsten-based material.
- 13. The method of claim 1 wherein the first core is substantially a powder having a specific gravity less than 3.0.
- 14. The method of claim 13 wherein the second core is lead-based.
- 15. The method of claim 1 further comprising loading the bullet in a case selected from the group consisting of 0.357 Magnum 0.357 Sig, 0.38 Special, 0.40 Smith & Wesson, 9 mm Luger, and 10 mm Automatic to form a cartridge.
- 16. The method of claim 15 wherein the case is 9 mm Luger.
- 17. The method of claim 15 wherein the loading inserts the bullet into the case so that the cartridge has a length of 1.165-0.025 inch.
- 18. The bullet of claim 1 having a maximum diameter between 0.35 and 0.46 inch.
- 19. A bullet comprising:
a jacket; a first core contained within the jacket; and a second core contained within the jacket aft of the first core; wherein the second core is lead-based and the first core consists in major part of a non-metallic powder.
- 20. The bullet of claim 19 wherein:
the first core comprises at least 80.0 weight percent of one or more carbonates; the second core comprises at least 95.0 weight percent lead; and the jacket comprises at least 50.0 weight percent copper.
- 21. The bullet of claim 19 being an ogival bullet.
- 22. The bullet of claim 19 being full metal case, non-hollowpoint bullet.
- 23. The bullet of claim 19 wherein the bullet is of nominal 9 mm caliber and has a mass of 123.5-124.5 grains.
- 24. A bullet comprising:
a jacket; a first core contained within the jacket; and a second core contained within the jacket aft of the first core, wherein:
the first core consists of at least 50 weight percent tin; and the second core consists of at least 50 weight percent tungsten.
- 25. The bullet of claim 24 wherein:
the first core has deformability effective so that the bullet will not defeat level 2 body armor when impacted thereon.
- 26. The bullet of claim 24 wherein:
the first core comprises at least 80.0 weight percent tin; the second core comprises at least 95.0 weight percent tungsten-filled polymer; and the jacket comprises at least 50.0 weight percent copper.
- 27. The bullet of claim 24 wherein:
the bullet has a weight of 120-125 grains.
CROSS-REFERENCE TO RELATED APPLICATION
[0001] This application claims benefit of U.S. patent application Ser. No. 60/294,169 filed May 29, 2001 and entitled “Dual Core Ammunition.” The disclosure of Ser. No. 60/294,169 is incorporated by reference herein as if set forth at length.
Provisional Applications (1)
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Number |
Date |
Country |
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60294169 |
May 2001 |
US |