Ep. 225 - The SCIENCE of Copper Bullets

Published on March 5, 2026
Duration: 69:59

This episode of the Hornady Podcast delves into the science and application of copper expanding bullets, specifically the Hornady CX. The discussion covers the historical context of copper bullets, their advantages over lead core options for certain hunting scenarios, and the specific material science behind Hornady's copper alloy. The team explains how the unique internal cavity design of the CX bullet allows for controlled expansion and deep penetration across various velocity regimes, making it a versatile choice for challenging game.

Quick Summary

Hornady CX copper expanding bullets utilize a zinc-copper alloy for enhanced toughness and reduced barrel fouling. Their precisely engineered internal cavity design allows for controlled expansion and deep penetration across various velocities, making them ideal for hunting challenging game where weight retention and terminal performance are critical.

Chapters

  1. 00:00Introduction to Copper Bullets
  2. 01:06Why Copper Bullets?
  3. 02:24Personal Use Cases for Copper Bullets
  4. 03:45Copper Bullets for Tough Game (Africa, Alaska)
  5. 04:41Copper Bullets for Bears and Aoudad
  6. 05:256mm ARC for Black Bear with CX
  7. 06:04Pigs and Warthogs with CX Bullets
  8. 06:33History of Copper Bullets at Hornady
  9. 08:15Randy Brooks and the Copper Bullet Idea
  10. 08:36Hornady's Entry into Copper Bullet Game (2009)
  11. 09:03Need for Monolithic Copper Expanding Bullets
  12. 10:37Copper Alloy vs. Pure Copper
  13. 11:05Benefits of Zinc Copper Alloy
  14. 11:37Reduced Barrel Fouling with Alloys
  15. 12:55Hardness and Toughness of Copper Bullets
  16. 13:35Manufacturing Copper Bullets: Swaging vs. Lathe Turning
  17. 15:40Advantages of Swaging for Copper Bullets
  18. 16:01Inside the CX Bullet: Cavity Design
  19. 16:42Controlling Expansion with Cavity Geometry
  20. 17:11CX Bullet Design for Different Velocities
  21. 18:00The Secret Sauce of Copper Bullet Design
  22. 18:45Hornady CX Bullet Features
  23. 19:16Outside of CX Bullets: Shape and Design
  24. 20:00Modern Bullet Shapes and Aerodynamics
  25. 20:26Limitations of Copper Bullet Weight
  26. 21:10Modern Cartridge Design and Bullet Efficiency
  27. 21:35Available CX Bullet Weights and Calibers
  28. 22:00The Role of the Polymer Tip in CX Bullets
  29. 22:24Importance of the Tip in Monolithic Bullets

Frequently Asked Questions

What makes Hornady CX bullets different from pure copper bullets?

Hornady CX bullets are made from a zinc-copper alloy, not pure copper. This alloy provides greater hardness and toughness, leading to superior terminal performance and reduced barrel fouling compared to pure copper. The alloy also allows for better control over expansion characteristics.

How does the internal design of a Hornady CX bullet contribute to its performance?

The internal cavity of a CX bullet is meticulously designed with specific geometry. This allows Hornady to control the bullet's expansion across a wide range of velocities, ensuring it expands reliably without fragmenting, thus maximizing penetration and weight retention on game.

Why are copper bullets like the Hornady CX preferred for certain hunting situations?

Copper expanding bullets offer superior penetration and weight retention, making them ideal for hunting tough-skinned game or when facing challenging shot angles. They are particularly effective for animals like bears, moose, elk, and African plains game where deep tissue damage is crucial for a quick, ethical harvest.

What manufacturing process does Hornady use for its copper bullets?

Hornady primarily uses swaging and drawing to manufacture its copper bullets. This process allows for precise control over the internal cavity's geometry and the bullet's overall shape, leading to more consistent performance and efficient production compared to lathe turning.

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