12 Gauge Explained

Published on January 11, 2024
Duration: 41:05

This comprehensive guide breaks down the 12 gauge shotgun cartridge, covering its historical origins, the technicalities of bore and chamber sizes, and the various components that constitute a shell. It delves into different load types, shot materials (lead, steel, bismuth, tungsten), shot sizes, and their applications, along with discussions on powder types, wads, and the physics of shot strings and cartridge speed. The information is presented to help users understand and select appropriate ammunition for various shooting disciplines.

Quick Summary

The 12 gauge shotgun cartridge is defined by its bore diameter, where 12 pure lead balls of that size would equal one pound. Actual bore sizes can vary, impacting pellet deformation. Different chamber lengths (2.5" to 3.5") and shot materials like lead, steel, bismuth, and tungsten offer diverse performance characteristics for various shooting applications.

Chapters

  1. 00:00Introduction to 12 Gauge
  2. 00:13What is a 12 Gauge?
  3. 01:13Nominal Bore Size vs. Actual Bore Size
  4. 02:03Tighter vs. Larger Bore Profiles
  5. 03:45Chamber Lengths Explained
  6. 04:53The 2-inch Cartridge History
  7. 06:07The 1 3/4-inch 'Shorty' Cartridge
  8. 07:28Modern Cartridge Lengths: 2.5" vs 2.75"
  9. 09:23The 3-inch Magnum Cartridge
  10. 11:33The 3.5-inch Magnum Cartridge
  11. 12:47Common 12 Gauge Cartridge Sizes
  12. 12:58Shotgun Cartridge Components
  13. 13:07Primer and Case Head
  14. 15:04Powder Types: Single vs. Double Base
  15. 17:19The Wad: Function and Types
  16. 21:18Shot Sizes Explained
  17. 23:25Shot Material: Lead
  18. 26:34Shot Material: Steel
  19. 28:17Shot Material: Bismuth and Tungsten
  20. 31:17Shot Sizes and Applications
  21. 33:56Cartridge Speed: Supersonic vs. Subsonic
  22. 38:12Shot String Explained
  23. 40:26Conclusion: Choosing the Right Cartridge

Frequently Asked Questions

What determines the 'gauge' of a shotgun shell?

The gauge of a shotgun shell, like 12 gauge, is determined by the number of pure lead balls of that diameter that would equal one pound. Therefore, a 12 gauge means 12 lead balls of that size make up a pound, indicating a specific bore diameter.

What is the difference between single-base and double-base gunpowder in shotgun shells?

Single-base gunpowder uses nitrocellulose for energy and is very stable. Double-base gunpowder adds nitroglycerin, offering potentially more power but is more sensitive to temperature changes, leading to variations in performance in extreme heat or cold.

Why is steel shot lighter than lead shot, and how does this affect its performance?

Steel is less dense than lead, making steel shot lighter for the same volume. This means steel shot decelerates faster and loses energy more quickly in flight. To compensate, shooters often use larger steel shot sizes than equivalent lead shot for comparable downrange performance.

What is a 'shot string' in shotgun ballistics?

A shot string is the phenomenon where pellets fired from a shotgun do not all arrive at the target simultaneously. The leading pellets travel faster, and the trailing pellets lag behind, creating a 'string' of shot that can be several feet long at typical hunting ranges.

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