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Here are a few key things to know about the 5.56x45mm NATO and .223 Remington cartridges:
1. Pressure and Velocity: The 5.56x45mm NATO cartridge is typically loaded to higher pressures and velocities compared to the .223 Remington. The 5.56mm NATO is designed for military use, while the .223 Remington is primarily used for civilian purposes.
2. Chamber Dimensions: The chambers of firearms designed for 5.56mm NATO and .223 Remington may have slightly different dimensions. The 5.56mm NATO chamber has a longer throat, allowing it to accommodate longer, higher-pressure military ammunition. The .223 Remington chamber has a shorter throat for improved accuracy with civilian ammunition.
3. Interchangeability: Generally, it is safe to shoot .223 Remington ammunition out of a firearm chambered in 5.56mm NATO. However, it is not recommended to fire 5.56mm NATO ammunition from a firearm chambered in .223 Remington due to the potential for higher pressures and safety concerns.
4. Rifling Twist Rates: The 5.56mm NATO is commonly associated with a faster rifling twist rate (1:7 or 1:9), which stabilizes longer and heavier bullets. The .223 Remington may have slower twist rates (1:12 or 1:10) for lighter bullets typically used in varmint hunting.
5. Availability and Use: The .223 Remington ammunition is widely available and suitable for various purposes such as target shooting, hunting small game, and self-defense. The 5.56mm NATO ammunition is primarily used by military and law enforcement personnel but can also be used for recreational shooting and hunting.
It's important to consult your firearm's manufacturer or an experienced gunsmith for specific information about your firearm and its compatibility with different ammunition types. Always follow proper safety guidelines and use the appropriate ammunition for your firearm to ensure safety and optimal performance.
