The 5.56 or 5.56x45mm ammunition, as it is most commonly called, is a heavily loaded round with high pressure. The pressure exerted by the 5.56 cartridge or ammunition is roughly 58,000 psi.
The Remington.223 or.233 ammo is specially engineered to tolerate less pressure than 5.56. The pressure exerted by .233 ammunition is estimated to be around 55,000 psi.
Key Takeaways
- The 5.56 NATO cartridge is a military round with higher pressure and velocity than the .223 Remington, a civilian round.
- Although the dimensions of the cartridges are similar, using a 5.56 NATO round in a firearm chambered for a .223 Remington can be dangerous.
- The 5.56 NATO round offers better penetration and performance at longer distances than the .223 Remington.
5.56 vs 223
The difference between 5.56 and .223 ammo is that the 5.56 or 5.56x45mm ammunition, as it is commonly known, is a heavily loaded round that produces a lot of pressure. Furthermore, the chambers of this ammunition have been specifically built to resist and retain tremendous pressure. The Remington.223 or.233 ammo is designed to tolerate less stress than 5.56 ammo. The.233 chambers aren’t built to withstand much pressure, either.
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The distance between the location where the bullet engages the weapon and the mouth of the cartridge is greater, with 5.56mm ammo.
Aside from that, it’s noted to have a larger lead with a less steep slope than—233 ammunition Chambers.
Because 5.56 ammunition has a longer lead, it aids in achieving reduced accuracy with increased velocity while decreasing the pressure applied.
Because it has a more extended throat than its counterpart,.233 ammo, the 5.56 ammo is believed to perform better.
The distance between the area where the bullet is engaged in the rifle and the mouth of the cartridge is shorter when using .233 ammunition.
It has a steeper slant and a shorter leade than 5.56 ammo Chambers.
Because .233 ammunition has a shorter leade, it aids in greater accuracy while maintaining a lower velocity but higher pressure.
Because it has a shorter throat than 5.56 ammunition, the .233 ammo is known to have lower performance.
Comparison Table
| Parameters of Comparison | 5.56 | 223 |
|---|---|---|
| Performance | Better | Comparatively less |
| Pressure exerted | 58,000 psi | 55,000 psi |
| Leade length, Angle | Leade length, Angle | Longer, less steep Angle |
| Accuracy | Low | High |
| Velocity | High | Low |
What is 5.56?
The pressure exerted by 5.56 ammo or ammunition is roughly 58,000 psi. Because it has a more extended throat than its counterpart,.233 ammo, 5.56 ammo is believed to perform better.
The 5.56 or 5.56x45mm ammunition, as it is commonly known, is a heavily loaded round with high pressure.
Furthermore, the chambers of this cartridge have been carefully built to withstand and hold tremendous pressure.
The distance between the location where the bullet is engaged in the rifle and the mouth of the cartridge is greater, with 5.56mm ammo.
Otherwise, it is known to have a larger lead with a less steep slope—233 ammunition Chambers.
Because 5.56 ammunition has a longer lead, it aids in achieving lower accuracy while increasing velocity and the pressure exerted is modest.
What is 223?
The pressure exerted by.233 ammunition or ammo is estimated to be around 55,000 psi. Because the.233 ammo has a shorter throat than the 5.56 ammo, it delivers less performance.
The Remington.223 or.233 ammunition is intended to tolerate less pressure than 5.56 ammo. The.233 chambers are also not built to withstand high pressure.
Because.233 ammunition has a shorter leade; it aids in obtaining improved accuracy while maintaining a lower velocity but higher pressure.
The distance between the place where the bullet is engaged in the rifle and the mouth of the cartridge is shorter with.233 ammunition. It has a shorter leade and a steeper angle than the 5.56 ammo Chambers.
Main Differences Between 5.56 and 223
- The popularly known 5.56 or the 5.56x45mm ammunition is highly loaded and exerts extremely high pressure. Moreover, this ammo’s chambers are specially designed to withstand and hold onto high pressure. On the other hand, the 223 or .233 Remington ammunition is specially designed to withstand comparatively less pressure than 5.56 ammo. The chambers of .233 are also not designed to bear heavy pressure.
- In the case of 5.56mm ammo, the distance between the area where the bullet is engaged in the rifle and the cartridge’s mouth is greater. Otherwise, it has a larger lead with a less steep angle than the Chambers of .233 ammo. On the other hand, in the case of .233 ammo, the distance between the area the bullet is engaged in the rifle and the cartridge’s mouth is less. It possesses a shorter leade with a steeper angle than the Chambers of 5.56 ammo.
- Due to the reason that 5.56 ammo possesses longer lead, it helps in acquiring reduced accuracy with increased velocity, and the pressure exerted is also low. On the other hand, because .233 ammo possesses a shorter leade, it helps in acquiring increased accuracy with a decreased velocity but with increased pressure.
- The 5.56 ammo or ammunition exerts a high pressure of approximately 58,000 psi. On the other hand, The .233 ammunition or ammo is known to exert a pressure of approximately 55,000 psi.
- The 5.56 ammo is known to perform better as it has a longer throat than its counterpart, the .233 ammo. On the other hand, the .233 ammo is known to provide comparatively lesser performance as it possesses a shorter throat than the 5.56 ammo.
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Piyush Yadav has spent the past 25 years working as a physicist in the local community. He is a physicist passionate about making science more accessible to our readers. He holds a BSc in Natural Sciences and Post Graduate Diploma in Environmental Science. You can read more about him on his bio page.
