Do heavier bullets have better stopping power for deer?

Bullet Kinetics and Stopping Power

The kinetic energy of a bullet is a critical factor in determining its stopping power. Heavier bullets, typically those with a diameter of 0.300 inches or larger, tend to retain more velocity and kinetic energy downrange, making them more effective at delivering a fatal wound to deer. For example, a 180-grain .30-06 Springfield bullet retains approximately 1,900 ft-lbs of kinetic energy at 200 yards, while a 150-grain .308 Winchester bullet retains around 1,400 ft-lbs.

Bullet Design and Expansion

However, bullet design and expansion characteristics also play a crucial role in determining stopping power. For instance, a bullet with a large diameter expansion ratio, such as the Barnes TSX or the Nosler AccuBond, can deliver a larger wound channel and increased kinetic energy transfer to the deer. On the other hand, a bullet with a smaller expansion ratio, such as the Speer Grand Slam, may require a larger diameter to achieve similar stopping power.

Practical Application

In practical hunting scenarios, a heavier bullet with a properly designed expansion profile can be an effective choice for deer. For example, a 180-grain .30-06 Springfield load with a 200-yard zero and a 20-inch barrel can deliver a bullet impact at 200 yards with a velocity of around 2,100 ft/s. This can result in a significant increase in kinetic energy and a larger wound channel, making it more effective at stopping deer quickly and humanely.