Smyth Busters: Should You Lubricate Your Ammunition?

Published on November 8, 2022
Duration: 6:41

This video debunks the myth of lubricating ammunition, explaining how it can cause excessive head thrust, increased bolt velocity, and false pressure signs. It highlights that such lubrication can lead to firearm malfunctions, accelerated wear, and issues with case expansion, particularly in semi-automatic and blowback-operated systems. The hosts emphasize addressing underlying firearm issues rather than using lubrication as a workaround.

Quick Summary

Lubricating ammunition is generally a bad idea for modern firearms. It can cause excessive head thrust, leading to higher bolt velocity, increased wear on components, and false pressure signs like blown primers. Proper firearm maintenance, not ammunition lubrication, is key to reliable function.

Chapters

  1. 00:03Introduction: Ammunition Lubrication Myth
  2. 00:38Viewer Question: Lubricating Ammo
  3. 01:21Problem 1: Excessive Head Thrust
  4. 02:04Consequences of Head Thrust
  5. 02:43False Pressure Signs
  6. 03:10Firearms Designed for Lubricated Ammo (Rare)
  7. 03:29Serious Risks: Lug Setback
  8. 04:22Handloader's Case Lube Reminder
  9. 04:38How Lubricant Hinders Case Expansion
  10. 05:12Semi-Auto & Blowback Issues
  11. 05:55Myth Busted: Do Not Lubricate Ammo
  12. 06:00Viewer Feedback Request

Frequently Asked Questions

What are the main risks of lubricating ammunition for firearms?

Lubricating ammunition can cause excessive head thrust, leading to higher bolt velocity and increased wear on critical firearm components like bolt lugs. It can also create false pressure signs, such as blown-back primers, and hinder proper case expansion in the chamber.

Why is case lubricant removal important for handloaders?

Handloaders must remove case lubricant after resizing because it can interfere with proper chambering and firing. Lubricant on ammunition prevents the case from expanding correctly, forcing pressure into the primer pocket and potentially causing malfunctions or damage.

How does lubricating ammunition affect semi-automatic and blowback firearms?

In semi-automatic firearms, lubricated ammo can cause overcycling due to increased bolt velocity. For blowback-operated systems, which rely on chamber friction to function, lubrication disrupts this critical element, leading to malfunctions and improper slide operation.

Are there any firearms that benefit from lubricated ammunition?

While extremely rare, some historical firearms, like certain Luger models, were designed to function with lubricated ammunition. However, for the vast majority of modern firearms, lubricating ammunition is detrimental and will cause significant problems.

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