Quick Answer
To zero a rifle, start at 100 yards with a 10-shot group, adjusting the scope for a central impact. Use a chronograph to measure bullet speed and a rangefinder for accurate distance measurement. Gradually move to longer ranges, making adjustments as needed.
Zeroing at 100 Yards
Begin by setting your rifle’s scope to the “zero” mark, which is usually marked on the reticle. From 100 yards, fire a 10-shot group, ensuring the impact is centered. Use a spotting scope or binoculars to verify the impact point. Measure the distance between the impact point and the center of the target. Adjust the scope’s elevation dial to move the impact point to the center. Repeat this process until the 10-shot group is centered.
Measuring Bullet Speed and Distance
To ensure accurate zeroing, use a chronograph to measure the bullet’s speed. The chronograph will provide a consistent speed reading, allowing you to calculate the bullet’s trajectory at different ranges. Next, use a rangefinder to measure the exact distance to the target. This will provide a more accurate reading than estimating the distance based on landmarks or measurements.
Zeroing at Longer Ranges
Once you have a centered impact at 100 yards, gradually move to longer ranges, starting at 200 yards. Use the same process as before, firing a 10-shot group and adjusting the scope as needed. Measure the distance between the impact point and the center of the target, and adjust the scope’s elevation dial to move the impact point to the center. Repeat this process at 300, 400, and 500 yards, or further, to ensure a consistent zero across different ranges.
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