Quick Answer
When zeroing your hunting rifle, consider making top adjustments for different weather conditions, including temperature, humidity, and wind, to ensure accurate shots. This involves understanding and applying ballistics corrections. For example, a 1-degree temperature change can affect point of impact.
Temperature Adjustments
Temperature is a critical factor when it comes to zeroing your rifle. A 1-degree temperature change can cause a 1.5-2.5 MOA shift in point of impact. To adjust for temperature, you can use the following rule of thumb: for every 1-degree change, move the zero 1.5-2.5 MOA. For example, if it’s 40°F and you shoot a group at 100 yards, and then it warms up to 60°F, you’ll need to move the zero 3-5 MOA downward to compensate.
Humidity Adjustments
Humidity also affects the trajectory of your bullet. Moisture in the air can increase the bullet’s weight, causing it to drop more quickly. As a general rule, for every 10% change in humidity, move the zero 1 MOA. This means that if you’re shooting in a humid environment, you may need to move the zero slightly downward to compensate.
Wind and Atmospheric Pressure Adjustments
Wind and atmospheric pressure also play a significant role in the trajectory of your bullet. However, these factors are more difficult to quantify, and adjustments can vary depending on the specific conditions. As a general rule, wind deflection can be estimated by using the Coriolis effect: for every 1 mph of wind, move the zero 1 MOA. Atmospheric pressure, on the other hand, affects the bullet’s trajectory more significantly, with a 1-inch drop in pressure causing a 1-2 MOA shift.
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