Top 5 Reasons We Miss Series | 2 | Improper Parallax

Published on October 25, 2023
Duration: 6:04

This video from Gunwerks Long Range University explains the critical concept of parallax in rifle scopes, identifying it as a common cause of missed shots. It details how parallax occurs when the reticle and target are not on the same focal plane and demonstrates a two-step process for checking and adjusting it using the scope's side focus knob. Proper parallax adjustment is crucial for ensuring the reticle remains stationary on the target as the shooter's eye position changes, thereby improving shot accuracy.

Quick Summary

Parallax in a rifle scope is the apparent movement of the reticle relative to the target as the shooter's eye position changes behind the scope. This occurs when the reticle and target are not on the same focal plane. To check for it, focus the target, then move your eye up and down behind the scope; if the reticle floats, adjust the side focus knob until it remains stationary.

Chapters

  1. 00:01Introduction to Gunwerks Long Range University
  2. 00:27Parallax: The #2 Reason for Missed Shots
  3. 00:35What is Parallax?
  4. 00:43Analogy: Pistol Sight vs. Scope Eye Box
  5. 01:14Visualizing Parallax: Reticle Movement
  6. 01:20Thumb Parallax Demonstration
  7. 01:45Consequences of Parallax
  8. 01:50Adjusting Parallax with Side Focus
  9. 02:08Two-Step Parallax Check Process
  10. 02:11Step 1: Focus the Target
  11. 02:25Step 2: Check for Reticle Movement
  12. 03:02Impact of Parallax Error on Shots
  13. 03:36Consistent Shooter, Inconsistent Group Center
  14. 03:50Parallax vs. Bad Data/Zero
  15. 03:57Scope Differences in Parallax
  16. 04:00Historical Parallax Adjustment (Marines)
  17. 04:35Modern Scope Parallax Adjustments
  18. 04:42Revic RS25i Parallax Forgiveness
  19. 05:06Leupold Scope Parallax Comparison
  20. 05:20Parallax as a Common Culprit
  21. 05:30Sniper Experience with Parallax
  22. 05:44Next Video: Top Mistake #1
  23. 05:53Join Long Range University

Frequently Asked Questions

What is parallax in a rifle scope and why does it cause missed shots?

Parallax occurs when the reticle and target are not on the same focal plane. This means the reticle appears to move relative to the target as your eye position behind the scope changes, leading to inaccurate aiming and missed shots, especially at longer distances.

How do you check for parallax in a rifle scope?

Place your rifle on a stable rest. First, focus the target image clearly using the scope's side focus knob. Then, align the crosshairs on the target and move your eye up and down behind the scope. If the crosshairs appear to float or move on the target, parallax is present.

How is parallax adjusted on a rifle scope?

Parallax is adjusted using the scope's side focus knob. After focusing the target, you fine-tune the side focus until moving your eye behind the scope results in no visible movement of the reticle across the target, ensuring a consistent aiming point.

Can parallax errors affect a consistent shooter?

Yes, even a consistent shooter can experience misses due to parallax. If the parallax is improperly set, the shooter might consistently place their eye in the same off-center position, resulting in a tight group of shots that are still significantly high or low of the intended point of impact.

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