Smyth Busters: Can You Interchange Rifle & Pistol Primers?

Published on February 16, 2021
Duration: 3:23

This video explores the interchangeability of rifle and pistol primers in reloading, highlighting critical safety concerns. While small rifle primers can sometimes be used in high-pressure pistol loads with strong mainsprings, using pistol primers in rifle cartridges is dangerous due to thinner cups. Large rifle primers are taller and can cause malfunctions if not seated correctly. The experts strongly advise adhering to reloading manuals for safety.

Quick Summary

It is generally unsafe to use pistol primers in rifle cartridges like .223 Remington because their thinner cups cannot contain the higher rifle pressures, potentially leading to dangerous failures. Conversely, small rifle primers can sometimes be used in high-pressure pistol loads if the firearm has a strong mainspring due to their thicker cups.

Chapters

  1. 00:00Intro: Primer Interchangeability Myth
  2. 00:35Small Rifle Primers in Pistol Loads
  3. 01:07High-Pressure Cartridge Needs
  4. 01:35Risks: Pistol Primers in Rifles
  5. 01:50Large Primer Size Differences
  6. 02:33Conclusion & Safety Advice

Frequently Asked Questions

Can I use small rifle primers in my 9mm pistol loads?

Potentially, yes, if your firearm has a strong mainspring. Small rifle primers have thicker cups than pistol primers, which can withstand the higher pressures found in some pistol cartridges like 9mm or .38 Super. However, always proceed with caution and consult reliable reloading data.

Is it safe to use pistol primers in rifle cartridges like .223 Remington?

No, it is generally unsafe. Rifle cartridges operate at significantly higher pressures than pistol cartridges. Pistol primers have thinner cups that may not contain these higher pressures, leading to potential firearm malfunctions or failures.

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

Large rifle primers are typically taller than large pistol primers. If a taller rifle primer is not seated fully flush within the cartridge case, it can protrude and cause feeding or ignition issues in semi-automatic firearms or slam-fires.

Are there any pistol cartridges that require rifle primers?

Yes, certain high-pressure pistol cartridges are designed to use rifle primers. Examples include the .454 Casull and 9x23mm cartridges, which operate at pressures around 50,000 psi, necessitating the stronger construction of rifle primers.

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