Ask Ian: .223 vs 5.56 and "Military Grade Ammo"

Published on December 22, 2022
Duration: 10:53

This video from Forgotten Weapons, featuring Ian McCollum, provides an expert analysis of the differences between .223 Remington and 5.56mm NATO cartridges. It clarifies the safety and interchangeability of these rounds in modern firearms, particularly the AR-15 platform, and discusses the meaning of 'military grade' ammunition.

Quick Summary

Ian McCollum explains that .223 Remington and 5.56mm NATO are largely interchangeable in modern rifles like the AR-15. The key difference is the chamber 'leade' (throat length); 5.56mm NATO has a longer leade for pressure management, potentially causing slightly higher pressures in tight .223 chambers, but rarely to dangerous levels. 'Military grade' ammo is typically safe for civilian use.

Chapters

  1. 00:00Intro: .223 vs 5.56 & Military Ammo
  2. 00:58History of .223 Remington
  3. 02:155.56 NATO Standardization
  4. 03:00SAAMI Standards & Compatibility
  5. 04:45Interchangeability & Pressure Differences
  6. 08:05What is 'Military Grade' Ammo?
  7. 09:05Specialty Military Rounds

Frequently Asked Questions

What is the main difference between .223 Remington and 5.56mm NATO ammunition?

The primary difference lies in the chamber dimensions, specifically the 'leade' or throat length. 5.56mm NATO typically has a longer leade to manage higher pressures, while .223 Remington has a shorter leade. This can result in slightly higher pressures when firing 5.56mm in a .223 chamber.

Can I safely shoot 5.56mm NATO ammo in my .223 Remington rifle?

Generally, yes, in most modern AR-15 style rifles. While a shorter .223 chamber can increase pressure with 5.56mm, it's rarely dangerous. However, always check your rifle's specific chambering and consider using .223 Remington ammunition for optimal safety and performance if unsure.

What does 'military grade' ammunition mean?

'Military grade' typically refers to ammunition produced under a government contract for military use. It's generally safe for civilian firearms, but specialized rounds like Armor Piercing (AP) or Tracer have specific effects and potential risks that should be understood before use.

Are .223 Remington and 5.56mm NATO cartridges interchangeable?

In most modern AR-15 platforms, they are largely interchangeable. However, 5.56mm NATO can generate slightly higher pressures due to its longer leade. Firing 5.56mm in a strict .223 chamber is possible but may not be ideal, whereas firing .223 in a 5.56mm chamber is always safe.

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