Quick Answer
For deer hunting with an AR-15, choose a bullet grain between 55-75 grains for optimal performance, taking into account the rifle's caliber, barrel length, and hunting distance. A heavier bullet is generally preferred for longer ranges, but lighter bullets are more suitable for shorter ranges. The right bullet grain ensures better accuracy and energy transfer.
Choosing the Right Caliber
When selecting a caliber for deer hunting with an AR-15, consider the available bullet options. Common calibers for deer hunting include .223 Remington, .243 Winchester, and 6.5 Grendel. Each caliber has its ideal bullet grain range, but for the .223 Remington, a 55-60 grain bullet is often preferred for its flatter trajectory and deeper penetration.
Bullet Grain Considerations
For optimal performance, choose a bullet grain based on the hunting distance. For ranges under 200 yards, a 55-60 grain bullet is suitable, while 65-70 grain bullets are preferred for longer ranges. At 500 yards or more, a 75 grain bullet is often necessary to maintain sufficient kinetic energy and penetration.
Barrel Length and Bullet Grain
AR-15 barrel length also affects bullet grain selection. A shorter barrel (14.5 inches or less) may require a lighter bullet to compensate for reduced velocity and range. Conversely, a longer barrel (16 inches or more) can handle heavier bullets, which may be more suitable for longer ranges or larger game.
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