Loophole Calculator

The Problem: Bullet Path vs. Line of Sight

When you dial elevation for a distant target, your barrel tilts up. At the same time, your barrel is physically below your scope (mechanical offset). This calculator determines the bullet's final path through a close obstacle by combining these two factors.

Why Is My Bullet Path Positive?

This is counter-intuitive but correct. At the short distance of the loophole, the bullet is still on the rising portion of its arc to the distant target. The upward angle from your dialed elevation is much greater than the downward mechanical offset, so the bullet passes through the loophole above your line of sight.

How To Use

1. Measure Height Over Bore: Use calipers or a tape measure to find the distance from the center of your barrel to the center of your scope. Enter this value in centimeters (cm).
2. Measure Distance to Loophole: Measure the distance from your scope's turret to the loophole. Enter this value in meters (m).
3. Enter Dialed Elevation: Input the elevation you have dialed on your turret for your long-range target in Mils.
4. Measure Loophole Height: Use a tape measure to measure the total height of the loophole opening. Enter this value in centimeters (cm).
5. Check Results: The calculator provides the final Bullet Path vs LOS and a GO / NO-GO decision based on the recommended aim point.

Formula Confirmation