Firearms Facts Episode 8: "The 7.62 Confusion"

Published on August 23, 2012
Duration: 6:17

This video clarifies the common confusion surrounding '7.62' designations in firearms. It explains how metric cartridge names indicate projectile diameter and case length, differentiating rounds like the 7.62x39mm (AK-47) from the 7.62x51mm NATO (.308 Winchester) and the rimmed 7.62x54R. The discussion also touches on less common 7.62 variants like the Tokarev and Nagant, highlighting the importance of precise nomenclature for safe and effective ammunition selection.

Quick Summary

The '7.62' in ammunition designations refers to the projectile diameter in millimeters. However, it's crucial to note the case length (e.g., 7.62x39mm vs. 7.62x51mm) as these are distinct cartridges, often not interchangeable, used in different firearms like the AK-47 and AR-10 respectively.

Chapters

  1. 00:11Intro: The 7.62 Confusion
  2. 00:51Metric Designation Explained
  3. 01:437.62x39mm & 9x18 Makarov
  4. 02:087.62x51mm NATO vs .308 Winchester
  5. 02:32Specialized 7.62 Rounds (Nagant, Tokarev)
  6. 03:11Other .30 Caliber Variants

Frequently Asked Questions

What does the '7.62' in ammunition mean?

The '7.62' in a metric cartridge designation refers to the diameter of the projectile in millimeters. However, this is often followed by another number, like 'x39' or 'x51', indicating the case length in millimeters, which is crucial as different 7.62 rounds are not interchangeable.

What is the difference between 7.62x39mm and 7.62x51mm?

The 7.62x39mm is an intermediate rifle cartridge, famous for its use in AK-47 and AKM rifles. The 7.62x51mm NATO is a full-power rifle cartridge, commonly known as .308 Winchester in the civilian market and used in rifles like the AR-10.

Is 7.62x51mm the same as .308 Winchester?

While often used interchangeably in civilian contexts, 7.62x51mm NATO and .308 Winchester are technically different specifications. The NATO round typically has slightly higher pressure limits and a shorter throat length. However, most modern firearms chambered for .308 Winchester can safely fire 7.62x51mm NATO.

What does the 'R' mean in 7.62x54R?

The 'R' in 7.62x54R stands for 'rimmed,' indicating that the cartridge case has a distinct rim at its base. This contrasts with rimless cartridges like the 7.62x39mm or 7.62x51mm, which are designed for different feeding mechanisms, typically found in bolt-action or semi-automatic rifles.

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