Quick Answer
Your arrows are grouping tight at 20 yards but not at 40 yards because the arrow's static weight and balance are not being accurately accounted for at the longer range, causing inconsistencies in arrow flight.
Cam Timing and Arrow Flight Dynamics
When shooting at 20 yards, the arrow has minimal time to experience aerodynamic drag, allowing the bow’s cam timing to dominate the arrow’s trajectory. However, at 40 yards, aerodynamic drag plays a significant role in arrow flight, making the bow’s cam timing less effective. This is where arrow rest adjustment and paper tuning become crucial. Check if your arrow rest is set too far forward, causing the arrow to be released at a 45-degree angle, resulting in poor accuracy.
Paper Tuning for Consistency
Paper tuning is a valuable technique to ensure your bow is consistently releasing the arrow at the same point of aim. To do this, set up a paper target at 20 yards and release 3-5 arrows, then move the target to 40 yards and repeat the process. Compare the point of impact (POI) at both distances to determine if your bow is shooting consistently. If the POI shifts significantly between the two distances, it indicates a cam timing or arrow rest adjustment issue.
Walk-Back Tuning for Precision
Walk-back tuning is an alternative method to paper tuning, where you walk backward while holding the bow at a 90-degree angle to the target. Release an arrow at each 5-yard interval, marking the point of impact on the target. This method helps identify any cam timing or arrow rest issues that may be affecting the arrow’s flight at different distances. By analyzing the pattern of POIs, you can make precise adjustments to your bow’s cam timing and arrow rest to achieve tighter shooting groups at both 20 and 40 yards.
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