Quick Answer
A bore sighter is not necessary for rifle zeroing, as it only provides a rough estimate and may not account for various factors like scope adjustment, bullet drop, and environmental conditions. A more accurate method involves using a shooting table or a laser range finder.
Preparing for Zeroing
Before starting the zeroing process, ensure your rifle is clean, well-lubricated, and properly sighted in with the bore sighter. Remove any covers or optics, and use a shooting table or laser range finder to calculate the initial target distance. For most rifles, a 100-yard zeroing is a good starting point. If you’re zeroing at a different distance, make sure to adjust the target accordingly.
Zeroing Process
Begin by firing a shot at the calculated distance and measuring the impact point. Use a spotting scope or rangefinder to determine the exact distance to the impact point. For a 100-yard zero, expect the bullet to drop around 2-3 inches at 200 yards. Adjust the scope accordingly, aiming for the center of the impact point. Repeat this process until the shot group falls within a 1-inch circle. It’s essential to take multiple shots at each adjustment to ensure accuracy.
Tips and Considerations
When zeroing a rifle, consider the environmental conditions, such as wind, temperature, and humidity, which can affect the bullet’s trajectory. Use a chronograph to measure the bullet’s velocity and calculate the ballistic coefficient. For high-velocity rounds, consider using a more precise zeroing method, such as the “walk-up” method, where you adjust the scope in small increments (1/4 MOA) and take multiple shots at each step.
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