Sneak Peek | Different Types of Ammo Patreon Only Video Two Part Series

Published on July 9, 2020
Duration: 9:50

This video from Geauga Firearms Academy clarifies common 9mm ammunition designations (9mm, 9x19mm, 9 Luger, 9 Para) and explains how numerical identifiers relate to projectile diameter and case length. It emphasizes that while some rounds share a projectile diameter, they are not interchangeable due to case length differences, which affect pressure and firearm timing. The instructor also touches on metric vs. imperial measurements for other calibers like 7.62mm and 5.56mm, highlighting the importance of understanding these distinctions to prevent dangerous mix-ups.

Quick Summary

Common 9mm ammunition designations include 9mm, 9x19mm, 9 Luger, and 9 Para. The 'x' followed by a number, like in 9x19mm, indicates the case length in millimeters. While most 9x19mm variants are interchangeable, other 9mm rounds like 9 Makarov (9x18mm) have different case lengths and are not compatible.

Chapters

  1. 00:00Introduction & Apology
  2. 00:28Two-Part Series on Ammunition
  3. 00:48Understanding 9mm Designations
  4. 01:009mm, 9x19mm, 9 Luger, 9 Para
  5. 01:11Introducing 9 Makarov
  6. 01:20Part 1: Explaining Designations & Numbers
  7. 01:23Part 2: Grains (Coming Soon)
  8. 01:43Manufacturer Designations
  9. 02:10Origin of 'Luger' and 'Para Bellum'
  10. 02:32All US 9mm is Interchangeable (with caveats)
  11. 02:529 Makarov vs. 9x19mm
  12. 02:58What '9mm' Refers To
  13. 03:31Different Cartridges, Same Diameter
  14. 03:439 Makarov (9x18mm) Explained
  15. 04:14Meaning of '9x19'
  16. 04:33Case Length Significance
  17. 05:04Impact of Case Length on Pressure
  18. 05:30Metric vs. Caliber Systems
  19. 05:44Example: 7.62x51mm vs. 7.62x39mm
  20. 06:157.62mm Projectile Diameter
  21. 06:33Second Numbers Mean Case Length
  22. 06:57Converting 9mm to Inches
  23. 07:129mm vs. .357 Magnum Comparison
  24. 07:37Common Caliber: 5.56x45mm (.223 Remington)
  25. 08:01Ammunition as Numeric Measurement
  26. 08:22Non-Interchangeable Example: 300 Blackout vs. 5.56/.223
  27. 08:43AR Platform Compatibility Issues
  28. 09:15Consequences of Using Wrong Ammo
  29. 09:34Conclusion & Next Video (Grains)

Frequently Asked Questions

What are the common designations for 9mm ammunition?

Common designations for 9mm ammunition include 9mm, 9x19mm, 9 Luger, and 9 Para (Parabellum). These terms generally refer to the same cartridge, though manufacturers may use different markings on their products.

How do designations like '9x19mm' and '9x18mm' differ?

The '9x19mm' designation means a 9mm projectile with a 19mm case length. '9x18mm' (9 Makarov) indicates a 9mm projectile with a shorter 18mm case length. This difference in case length makes them non-interchangeable and affects firearm pressure and timing.

Are all 9mm cartridges interchangeable?

While most 9x19mm variants (9mm, 9 Luger, 9 Para) are interchangeable, rounds like 9 Makarov (9x18mm) are not. It's crucial to check the specific caliber marking on both your firearm and ammunition to ensure compatibility and safety.

What does the second number in metric ammunition designations signify?

In metric ammunition designations like '9x19mm' or '7.62x51mm', the second number represents the length of the cartridge case in millimeters. This measurement is critical for proper firearm function and safety.

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