Can Environmental Changes Affect Bullet Performance After Zeroing?

Environmental Factors Affecting Bullet Trajectory

Temperature is a significant factor in bullet performance. For every 10-degree Fahrenheit change in temperature, a bullet’s velocity can increase or decrease by approximately 1.1 percent. This may not seem like much, but over long distances, it can add up. For example, a 100-yard shot at 80 degrees Fahrenheit might become a 101.1-yard shot at 90 degrees Fahrenheit.

Effects of Humidity and Air Pressure

Humidity and air pressure also play a crucial role in bullet performance. When the air is humid, the bullet’s expansion and contraction can be affected, leading to inconsistent accuracy. Similarly, changes in air pressure can alter the bullet’s trajectory. For instance, a 1-inch change in air pressure at sea level can affect the bullet’s trajectory by approximately 1.8 minutes of angle (MOA) at 100 yards.

Compensating for Environmental Changes

To compensate for environmental changes, hunters should consider the following techniques:

• Use a ballistic calculator to account for temperature, humidity, and air pressure fluctuations.
• Shoot in the morning or late afternoon when temperatures are more stable.
• Use a rifle with a well-maintained action and a consistent trigger pull to minimize the effects of environmental changes.
• Consider using a scope with a reticle designed for long-range shooting, which can help compensate for bullet drop and wind deflection.
• Practice shooting in different environmental conditions to develop a better understanding of how to adapt your aim and technique.