Scope Tracking: Tall Target Test | Applied Ballistics with Bryan Litz

This guide details the Tall Target Test, a crucial drill for verifying rifle scope tracking accuracy, as explained by ballistician Bryan Litz. The test involves zeroing a rifle, dialing significant elevation, and measuring the actual point of impact shift against the expected shift to identify mechanical scope errors. Proper setup, including ensuring the target is plumb, is emphasized to avoid cant errors. This technique is vital for ensuring reliable long-range accuracy.

Quick Summary

The Tall Target Test verifies rifle scope tracking accuracy by comparing actual impact shifts to expected shifts after dialing significant elevation. Essential for long-range precision, it requires a plumb target and precise measurements to identify mechanical scope errors.

Chapters

  1. 00:00Introduction to Long-Range Accuracy
  2. 00:34The Tall Target Test Explained
  3. 02:12Importance of Leveling
  4. 03:53Demonstration and Range Verification
  5. 06:41Calculating Correction Factors
  6. 09:22Troubleshooting Scope Errors

Frequently Asked Questions

What is the purpose of the Tall Target Test?

The Tall Target Test is a drill designed to verify the vertical tracking accuracy of a rifle scope. It helps identify mechanical errors in the scope or its mounting system that could cause misses at long range by comparing actual impact shifts to expected ones.

How do you perform the Tall Target Test?

First, zero your rifle at 100 yards. Then, dial a significant amount of elevation (e.g., 30 MOA), ensure your rifle is perfectly level, and fire another group. Measure the vertical shift and compare it to the calculated expected shift.

Why is using a carpenter's level important for the Tall Target Test?

Using a carpenter's level ensures the rifle and target are perfectly vertical. This prevents cant errors, which can skew the results by introducing windage shifts when elevation is dialed, leading to inaccurate assessment of scope tracking.

What formulas are used in the Tall Target Test?

The primary formula calculates the Expected Point of Impact shift: Range (yards) x Dialed Elevation (MOA) x 0.01047. This is compared to the Actual Shift to determine a Correction Factor for scope tracking errors.

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