Factory Ammo: Does Bullet Type Impact Terminal Performance?

Choosing the Right Bullet Type

When it comes to factory ammunition, bullet type plays a crucial role in terminal performance. For hunting and self-defense, a bullet’s ability to expand upon impact is critical. The expansion of a bullet affects its penetration and weight retention, which can be influenced by the bullet’s shape, material, and design. For example, full-metal jacket (FMJ) bullets tend to have poor expansion and are often used for target shooting, while hollow point (HP) bullets are designed to expand and are typically used for hunting and self-defense.

The Role of Bullet Shape

The shape of a bullet can significantly impact its terminal performance. A bullet with a rounded or ogival shape tends to expand more easily upon impact, while a bullet with a pointed or spitzer shape tends to penetrate deeper and may not expand as much. For example, a typical .308 Winchester hunting cartridge might use a 150-grain or 180-grain bullet with a rounded shape, while a .308 Winchester FMJ target cartridge might use a 150-grain or 168-grain bullet with a pointed shape.

Weight Retention and Penetration

Weight retention and penetration are also critical factors in terminal performance. A bullet that maintains its weight and penetrates deeply is more effective at transferring kinetic energy to its target, while a bullet that fragments or disintegrates may not be as effective. To achieve optimal weight retention and penetration, manufacturers often use a combination of bullet design and construction techniques, such as using a lead core with a copper jacket or using a specialized bullet material. For example, some factory loads for hunting and self-defense use a 180-grain or 200-grain bullet with a copper jacket, which helps to maintain weight retention and penetration.