The AR-15 platform's popularity stems partly from its versatility. However, understanding the different ammunition calibers available can be confusing for newcomers. This comprehensive guide provides a clear AR-15 rifle ammo size chart, detailing the most common calibers and their specifications. We'll explore their ballistics, applications, and help you choose the right ammunition for your needs.
Understanding AR-15 Ammunition: Key Considerations
Before diving into the chart, let's clarify some crucial aspects of AR-15 ammunition:
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Caliber: This refers to the diameter of the bullet, usually expressed in inches or millimeters. For AR-15s, the most common caliber is .223 Remington/5.56x45mm NATO, but others exist.
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Case Length: This dimension is critical for proper chambering and function. A mismatch can lead to malfunctions.
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Bullet Weight: Measured in grains (gr), this affects the bullet's velocity, energy, and trajectory. Heavier bullets generally have flatter trajectories but lower velocities.
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Bullet Type: Various bullet types, such as Full Metal Jacket (FMJ), Hollow Point (HP), Soft Point (SP), and others, offer different performance characteristics concerning expansion, penetration, and target effect.
AR-15 Ammo Size Chart: Common Calibers
The following chart outlines the key characteristics of popular AR-15 calibers: Remember to always consult your firearm's owner's manual to ensure compatibility.
| Caliber | Case Length (approx.) | Common Bullet Weights (gr) | Applications | Notes |
|---|---|---|---|---|
| .223 Remington | 1.75 inches | 55, 62, 69, 77 | Target practice, hunting small game, self-defense | Widely available and relatively inexpensive. |
| 5.56x45mm NATO | 1.75 inches | 55, 62, 69, 77 | Military, law enforcement, self-defense | Slightly higher pressure than .223 Remington; may not be suitable for all .223 chambers. |
| .300 Blackout | 1.76 inches | 110, 125, 150, 220 | Short-range hunting, home defense, suppressed use | Subsonic ammunition options available. |
| 6.8 SPC | 2.00 inches | 110, 115, 120, 130 | Hunting medium-sized game, law enforcement | Increased power and stopping power compared to .223/5.56mm. |
| 6.5 Grendel | 1.93 inches | 120, 123, 130 | Long-range target shooting, hunting | Flatter trajectory and longer range than .223/5.56mm. |
Note: The approximate case lengths provided are for general guidance. Slight variations may occur between manufacturers.
Choosing the Right Ammunition for Your AR-15
The best ammunition for your AR-15 depends heavily on its intended use:
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Target Practice: .223 Remington with lighter bullets (55-62 gr) is a cost-effective and widely available option.
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Home Defense: .223 Remington or 5.56x45mm NATO with heavier bullets (69-77 gr) or .300 Blackout are popular choices due to their stopping power. Consider expanding ammunition like Hollow Points.
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Hunting: The choice depends on the game. .300 Blackout for smaller game, 6.8 SPC for medium-sized game, and 6.5 Grendel for larger animals are all viable options.
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Long-Range Shooting: 6.5 Grendel is preferred for its superior accuracy and longer range.
Safety Precautions
Always handle firearms responsibly and follow all safety regulations. Never exceed the maximum pressure ratings specified for your firearm. Improper ammunition use can result in serious injury or damage to the weapon. Consult your firearm's owner's manual for detailed instructions on safe ammunition handling and use.
This guide provides a foundational understanding of AR-15 ammunition. Further research and consultation with experienced shooters or gunsmiths are always recommended before making any ammunition purchases. Remember that responsible firearm ownership includes thorough knowledge and adherence to all safety guidelines.
