How to Make Super Accurate Ammo ~ Part II Sizing Brass

Published on February 8, 2023
Duration: 19:38

This video details the process of neck sizing brass using a Lee Collet Die for improved ammunition accuracy. The instructor emphasizes the importance of proper brass preparation as the 'launch platform' for consistent internal ballistics. He contrasts standard full-length sizing with neck sizing, highlighting the benefits of the Lee Collet Die's unique mandrel and collet system for uniform neck sizing without lubricant, which he claims leads to superior accuracy and longer brass life.

Quick Summary

Proper brass sizing is crucial for accurate ammunition, acting as the 'launch platform' for internal ballistics. Inconsistent brass can cause pressure variations and flyers. Standard full-length dies can deform brass, while the Lee Collet Neck Sizing Die offers uniform neck sizing without lubricant, improving accuracy and brass life. Avoid neck sizing only when switching rifles or using certain firearm types.

Chapters

  1. 00:00Introduction and Importance of Brass
  2. 01:57Brass Weight Variation and Manufacturers
  3. 03:45Consequences of Inconsistent Brass
  4. 04:41Sizing Dies Explained: Full Length vs. Neck
  5. 07:19The Lee Collet Neck Sizing Die
  6. 09:01Lee Collet Die Mechanism Breakdown
  7. 11:05Reassembling the Lee Collet Die
  8. 12:09Preferred Sizing Method
  9. 13:40Benefits of Neck Sizing (No Lubricant)
  10. 15:09Final Sizing and Case Removal
  11. 15:14When NOT to Use Neck Sizing Only
  12. 16:14Neck Sizing vs. Full Length Sizing for Accuracy
  13. 17:01Limitations of Neck Sizing for Hunting/Competition
  14. 18:05Brass Longevity with Neck Sizing
  15. 18:24Conclusion and Final Thoughts

Frequently Asked Questions

Why is proper brass sizing crucial for accurate ammunition?

Proper brass sizing is critical because it forms the 'launch platform' for internal ballistics. Inconsistent brass weight or dimensions can lead to variations in internal pressure and velocity, resulting in flyers and reduced accuracy, especially at longer ranges.

What are the drawbacks of standard full-length sizing dies?

Standard full-length sizing dies force brass back to original factory dimensions. This process can cause brass deformation, work hardening, and potentially create a 'double shoulder' effect if not performed correctly, negatively impacting case integrity and consistency.

How does the Lee Collet Neck Sizing Die differ from standard dies?

The Lee Collet Neck Sizing Die uses a unique collet and mandrel system. It uniformly sizes only the neck of the brass case without a sizing button, preventing distortion, eliminating the need for lubricant, and promoting better concentricity for increased accuracy.

When should neck sizing only be avoided in reloading?

Neck sizing only should be avoided when switching brass between different rifles, as each chamber is unique. It's also not recommended for lever-action rifles, auto-loaders, or any firearm that requires significant camming action to close the bolt, as it can lead to extraction difficulties.

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