How does ammunition type affect performance in an AR-15?

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Choosing the Right Bullet Weight When it comes to deer hunting with an AR-15, bullet weight plays a crucial role in determining penetration and expansion. Heavier bullets, typically 75-90 grains, tend to penetrate deeper, often through larger animals or at longer ranges. However, they may not expand as much as lighter bullets. In contrast, lighter bullets, often 55-70 grains, tend to expand more, creating a larger wound channel and increasing the chances of a quick kill. For example, the 62-grain Hornady SST is known for its excellent expansion and penetration, making it a popular choice for deer hunting.
Understanding Bullet Types There are several types of bullets available for AR-15s, each with its own strengths and weaknesses. Full metal jacket (FMJ) bullets are best suited for target shooting and longer-range engagements, as they offer minimal expansion and penetration. Soft-point bullets, often used for hunting, offer a balance between expansion and penetration. The Hornady SST, mentioned earlier, is a soft-point bullet that expands well and retains its weight. However, when hunting larger animals, like elk or moose, it’s essential to use a heavier bullet, such as the 80-grain Nosler Partition, which offers deeper penetration and better weight retention.
Considerations for Hunting Deer When hunting deer with an AR-15, it’s essential to consider the specific circumstances of the hunt. In areas with dense cover, a heavier bullet may be necessary to penetrate through trees and underbrush. In areas with open terrain, a lighter bullet may be sufficient. Additionally, the distance to the target and the animal’s size also play a significant role in choosing the right ammunition. A general rule of thumb is to use a bullet that weighs at least 70 grains for deer hunting, but this can vary depending on the specific situation.