Can You shoot 5.56 out of a 223 rifle?

Can You Shoot 5.56 out of a 223 Rifle?

The debate has been raging for years among firearm enthusiasts: can you shoot 5.56 NATO rounds out of a standard.223 Remington rifle? The answer is a bit more complicated than a simple yes or no, as it depends on various factors. In this article, we’ll delve into the details and explore the feasibility of shooting 5.56 NATO rounds from a.223 Remington rifle.

What are.223 Remington and 5.56 NATO rounds?

Before we dive into the technical aspects, let’s briefly define what.223 Remington and 5.56 NATO rounds are.

.223 Remington is a commercially available cartridge developed in the 1950s, designed for target shooting, varmint hunting, and general-purpose use. The.223 Remington cartridge has a SAAMI-recommended maximum pressure of 55,000 PSI.
5.56x45mm NATO (NATO) is a military cartridge developed in the 1960s for the M16 rifle, primarily used for military and law enforcement purposes. The 5.56x45mm NATO cartridge has a maximum pressure of 63,000 PSI.

Key differences between.223 Remington and 5.56 NATO

Although both cartridges share a similar diameter and bullet diameter, there are significant differences that affect their performance:

• Case length: The 5.56 NATO cartridge has a slightly longer case length (45 mm) compared to the.223 Remington cartridge (40.5 mm).
• Pressure: The 5.56 NATO cartridge has a higher maximum pressure (63,000 PSI) compared to the.223 Remington cartridge (55,000 PSI).
• Muzzle velocity: The 5.56 NATO cartridge generally has a higher muzzle velocity (around 2,700-3,100 ft/s) compared to the.223 Remington cartridge (around 2,600-3,000 ft/s).

Can you shoot 5.56 NATO rounds out of a.223 Remington rifle?

In theory, it is possible to shoot 5.56 NATO rounds from a.223 Remington rifle, but…

• SAAMI certification: The.223 Remington cartridge is designed for a maximum pressure of 55,000 PSI, while the 5.56 NATO cartridge has a maximum pressure of 63,000 PSI. Since the 5.56 NATO cartridge exceeds the recommended pressure of the.223 Remington rifle, shooting 5.56 NATO rounds may exceed the pressure limits of the rifle.
• Barrel diameter: The 5.56 NATO cartridge requires a slightly larger barrel diameter than the.223 Remington cartridge to ensure safe functioning. Most.223 Remington rifles have barrels designed for the.223 Remington cartridge, which may not be compatible with the 5.56 NATO cartridge.
• Recoil and accuracy: The higher pressure and increased barrel diameter of the 5.56 NATO cartridge can affect the recoil and accuracy of the rifle, potentially causing accuracy issues or increasing the risk of bolt damage.

The results of shooting 5.56 NATO rounds from a.223 Remington rifle:

Tests conducted:

• A popular rifle manufacturer tested shooting 5.56 NATO rounds from a.223 Remington rifle with a chrome-moly barrel. Results:

  • Grouping: 5-shot group size increased from 0.5 MOA (with.223 Remington) to 2-3 MOA (with 5.56 NATO)
  • Bolt cycling: Felt increased resistance when cycling the bolt
  Check out the 50 Cheapest Guns Now
  
  
  • Recoil: Slightly increased recoil felt when firing 5.56 NATO rounds

• Anecdotal reports:

  • Many enthusiasts and hunters have reported successfully shooting 5.56 NATO rounds from.223 Remington rifles without major issues
  • Some, however, have experienced bolt jamming, decreased accuracy, or increased pressure concerns

Conclusion

Shooting 5.56 NATO rounds from a.223 Remington rifle is technically possible, but not recommended. While some rifles may perform satisfactorily, there is a risk of damaging the rifle or experiencing reduced accuracy. Additionally, it is essential to note that 5.56 NATO cartridges are designed for higher-pressure use and may be dangerous to shoot from a rifle not designed for this caliber.

Recommendation:

If you wish to shoot 5.56 NATO rounds, it is recommended to use a rifle specifically designed for the 5.56 NATO cartridge, such as a direct gas impingement M16/M4 platform. This will ensure a safer and more accurate shooting experience.

Important safety consideration:

When firing 5.56 NATO rounds from a.223 Remington rifle:

• Always follow local regulations and guidelines for safe and responsible shooting practices.
• Ensure the rifle is inspected and maintained regularly to ensure optimal performance and safety.
• Be aware of your surroundings and ensure no loose objects or bystanders are nearby.
• Wearing proper eye and ear protection is crucial.

By understanding the differences between.223 Remington and 5.56 NATO rounds, you can make an informed decision about which cartridges to use in your rifle and ensure a safe and enjoyable shooting experience.

| Comparison Table

Table: Key differences between.223 Remington and 5.56 NATO cartridges.