Quick Answer
Yes, adjust your zero for different hunting locations, especially when changing elevations or shooting at varying yardages, to ensure accurate shots and prevent scope walk.
Environmental Factors to Consider
When hunting at different elevations, the atmospheric conditions change significantly. For every 1,000 feet of elevation gain, the atmospheric pressure decreases by about 0.29 inches of mercury. This decrease in pressure causes the bullet to drop more, requiring a higher elevation adjustment. To account for this, hunters should adjust their scope’s elevation by 1-2 mils (or 3.38-6.75 minutes of angle) for every 1,000 feet of elevation gain.
Zeroing at Varying Yardages
As shooting distance increases, the bullet’s trajectory changes, requiring adjustments to the zero. For example, at 200 yards, a standard 5.56mm or .308 Winchester cartridge will drop approximately 3.35 inches below the initial point of impact. To account for this, hunters should adjust their scope’s elevation by 3-4 mils (or 10.1-13.4 minutes of angle) for every 100 yards of distance.
Practical Zeroing Techniques
To simplify the zeroing process, hunters can use a “stadiametric” reticle, which features graduated lines to aid in estimating distances and making adjustments. Additionally, when zeroing at varying yardages, hunters should use a ballistic calculator or consult a ballistic chart to determine the optimal elevation adjustment. This will help ensure accurate shots even at long distances.
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