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Sight Height Formula:
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Sight Height (SH) is the vertical distance between the centerline of a firearm's bore and the centerline of the scope or sight. It's a critical measurement for proper scope mounting and zeroing.
The calculator uses the Sight Height formula:
Where:
Explanation: The formula calculates the vertical offset between the firearm's bore and the optical sight by accounting for the firearm's dimensions and mounting hardware height.
Details: Accurate sight height calculation is essential for proper scope alignment, accurate zeroing, and understanding bullet trajectory relative to the line of sight. It affects both short-range zero and long-range ballistics.
Tips: Enter all measurements in inches. Centerline Height and Bore Height should be measured from the same reference point. Base/Ring Height is the combined height of the scope mount and rings.
Q1: Why is sight height important for accuracy?
A: Sight height affects the angle between the line of sight and bore axis, which influences where the bullet strikes relative to your aim point at different distances.
Q2: How do I measure Centerline Height and Bore Height?
A: Measure from the bottom of the firearm's action or rail to the center of the scope mounting surface (CH) and to the center of the bore (BH).
Q3: Does sight height affect long-range shooting?
A: Yes, greater sight height creates a larger offset between line of sight and bore axis, which affects the bullet's trajectory and requires compensation at longer ranges.
Q4: Are there standard sight heights for different firearms?
A: While there are common heights, optimal sight height depends on your specific firearm, optic, shooting position, and personal preference.
Q5: Can I use this calculator for iron sights?
A: Yes, the same principle applies, though iron sights typically have much lower height values than scopes.