Quick Answer
Zeroing your rifle at one setting and expecting it to hold point of aim with different bullet types can be unreliable, as bullet trajectory varies significantly between types.
Understanding Bullet Trajectory
When hunting, different bullet types can have varying ballistic coefficients, sectional densities, and barrel lengths, all of which affect their trajectory. For example, a 7mm Remington Magnum with a 120-grain bullet and a ballistic coefficient of 0.4 will have a significantly different trajectory than a 7mm Remington Magnum with a 160-grain bullet and a ballistic coefficient of 0.45. This means that relying solely on your zero settings may result in unpredictable bullet placement.
Zeroing with Different Bullet Types
To ensure accurate shots, it’s essential to zero your rifle for each bullet type you plan to use. This can be done by adjusting your scope’s elevation and windage settings to compensate for the bullet’s unique trajectory. A good rule of thumb is to re-zero your rifle after every 10-20 rounds, as the barrel can start to heat up and affect the bullet’s trajectory. This may require making adjustments every 20-30 minutes during a long hunt.
Re-Zeroing Techniques
When re-zeroing your rifle, start by adjusting the elevation setting first, as this will have the greatest impact on bullet trajectory. Begin by shooting at a target at 100 yards and adjusting the elevation setting until the bullet hits the center of the target. Once you’ve achieved this, you can adjust the windage setting to ensure the bullet is hitting the center of the target. Repeat this process several times to ensure your rifle is properly zeroed for the new bullet type.
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