Quick Answer
To calculate lead for fast-moving deer, use the "hold over" method: estimate the deer's speed and trajectory, then hold the crosshairs 6-8 inches above the animal's expected impact zone. This allows for proper bullet drop and penetration.
Calculating Deer Speed
Deer speed can range from 15 to 30 miles per hour, depending on the terrain and the animal’s motivation. For accurate lead calculation, estimate the deer’s speed in yards per second by dividing its speed in miles per hour by 1.47. For example, a deer traveling at 25 miles per hour equals approximately 17 yards per second.
Trajectory and Bullet Drop
A 300-grain .30-06 bullet dropped 10 inches at 100 yards, 20 inches at 200 yards, and 30 inches at 300 yards. For fast-moving deer, a more conservative approach is to assume a 6-inch bullet drop at each 100-yard increment. This allows for a margin of error and ensures the bullet hits the deer in the vitals.
Lead Calculation Techniques
To calculate the lead, use a “hold over” method or a “lead factor” chart. For the hold over method, estimate the deer’s speed and trajectory, then hold the crosshairs 6-8 inches above the animal’s expected impact zone. For a lead factor chart, consult a ballistic calculator or a table that lists lead values based on rifle caliber, bullet weight, and distance.
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