Smyth Busters: Can You Interchange Rifle & Pistol Primers?

Published on February 16, 2021
Duration: 3:23

This video from Brownells experts Caleb and Steve addresses the common reloading myth of interchanging rifle and pistol primers. They explain the critical differences in primer cup thickness and height, detailing why using pistol primers in high-pressure rifle cartridges like the .223 is dangerous due to insufficient pressure containment. Conversely, they discuss how small rifle primers can sometimes be used in high-pressure pistol loads if the firearm's mainspring is robust enough, and why certain high-pressure cartridges like the .454 Casull are designed for rifle primers. The experts strongly advise consulting reloading manuals for safe and reliable practices, emphasizing that while some interchangeability might be technically possible with extensive load development, it's generally a risky endeavor.

Quick Summary

It is generally unsafe to use pistol primers in rifle cartridges like the .223 Remington because their thinner cups cannot withstand the higher pressures, risking dangerous failures. While small rifle primers might work in some high-pressure pistol loads with a strong mainspring, this is a risky practice. Always consult reloading manuals for safe primer selection based on cartridge pressure and firearm type.

Chapters

  1. 00:00Introduction to Primer Myth
  2. 00:35Small Rifle Primers in Pistol Loads
  3. 01:07Specific Cartridge Requirements
  4. 01:35Risks of Using Pistol Primers in Rifles
  5. 01:50Large Primer Differences
  6. 02:33Conclusion and Safety Advice

Frequently Asked Questions

Can I use rifle primers in my pistol cartridges?

While small rifle primers can sometimes be used in high-pressure pistol loads like 9mm or .38 Super if the firearm has a strong mainspring, it's a risky practice. Rifle primer cups are thicker, and using them requires careful load development. Always consult reloading manuals for specific recommendations.

Is it safe to use pistol primers in rifle cartridges?

No, it is generally unsafe to use pistol primers in rifle cartridges like the .223 Remington. Pistol primers have thinner cups that cannot reliably contain the significantly higher pressures generated by rifle cartridges, potentially leading to dangerous failures.

What is the main physical difference between large rifle and large pistol primers?

Large rifle primers are typically taller than large pistol primers. If a large rifle primer is seated too high ('proud') in a case, it can cause malfunctions such as slam-fires in semi-automatic firearms or ignition issues in revolvers.

What are the risks of interchanging rifle and pistol primers?

The primary risks include primer failure to ignite, primer blow-by (gas leakage), case ruptures, and firearm damage due to pressure differences. Using pistol primers in high-pressure rifle rounds is particularly dangerous.

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