What Bullets Do AR-15s Shoot? A Comprehensive Guide
The AR-15 platform's versatility is partly defined by the wide range of ammunition it can fire. While commonly associated with .223 Remington and 5.56x45mm NATO rounds, the reality is more nuanced. Understanding the differences between these calibers and other less common options is crucial for responsible AR-15 ownership.
.223 Remington vs. 5.56x45mm NATO: The Key Differences
The most frequent question regarding AR-15 ammunition centers on the distinction between .223 Remington and 5.56x45mm NATO. While seemingly interchangeable, key differences exist:
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Chamber Pressure: 5.56 NATO rounds operate at significantly higher chamber pressures than .223 Remington. Firing 5.56 ammunition in an AR-15 chambered for only .223 Remington can lead to dangerous overpressure, potentially causing damage to the firearm and injury to the shooter.
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Case Dimensions: While similar, subtle variations in case dimensions exist. While many .223 Remington chambers can handle 5.56 NATO rounds safely, the reverse is not always true. Always check your firearm's manufacturer's specifications.
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Bullet Weight & Velocity: Both calibers feature a variety of bullet weights and velocities, influencing range, accuracy, and intended purpose. However, the higher pressure of 5.56 NATO generally leads to higher velocities.
Recommendation: If your AR-15's owner's manual specifies it's safe for both, you may use either. However, it's generally safer and recommended to use .223 Remington ammunition in an AR-15 chambered specifically for .223 Remington.
Beyond .223 and 5.56: Exploring Other AR-15 Calibers
Although less common, the AR-15 platform’s modularity allows for other calibers with the appropriate barrel and bolt carrier group changes. These include but are not limited to:
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.300 Blackout: A subsonic cartridge designed for suppressed operation and close-quarters combat. Its heavier bullets offer increased stopping power compared to .223/5.56.
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6.8 SPC: This round delivers increased energy and range compared to .223/5.56, making it more effective for hunting or longer-range shooting.
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6.5 Grendel: Another popular option providing improved accuracy and ballistics compared to .223/5.56, ideal for hunting and precision shooting.
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.224 Valkyrie: A relatively newer cartridge, offering exceptional accuracy and long-range performance.
Important Considerations:
- Always consult your firearm's owner's manual: This is the definitive source for safe ammunition use. Using the incorrect ammunition can lead to serious injury or damage to your firearm.
- Understand bullet construction: Different bullets are designed for various purposes; consider bullet weight, type (FMJ, JHP, etc.), and intended use when making selections. For example, Full Metal Jacket (FMJ) rounds are better suited for target practice, while Hollow Point (JHP) rounds are commonly preferred for self-defense applications.
- Ammunition storage: Proper storage is vital to maintain ammunition quality and safety. Keep your ammunition in a cool, dry place, away from direct sunlight and extreme temperatures.
This information provides a foundational understanding of the bullets commonly used in AR-15s. Always prioritize safety and consult relevant resources before handling firearms or ammunition. Remember, safe gun handling practices are paramount.
