Hornady Bullet Guide

 

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Hornady® 4DOF® Ballistic Calculator

Why compare the flight of you bullet to a standard G1 or G7 projectile when you can use your own projectile as the standard?

Current ballistic calculators provide 3 degrees of freedom in their approach; windage, elevation and range, but treat the projectile as an inanimate lump flying through the air. The Hornady® 4DOF® (Four Degrees of Freedom) calculator incorporates the projectile’s movement in the standard 3 degrees but also adds its movement about its center of gravity and subsequent angle relative to its line of flight, which is the 4th degree of freedom.

The Hornady® 4DOF® calculator provides trajectory solutions based on projectile Coefficient of Drag (not ballistic coefficient) along with the exact physical modeling of the projectile and its mass and aerodynamic properties. It will correctly calculate the vertical shift a bullet experiences as it encounters a crosswind; referred to as aerodynamic jump.

Using Doppler radar, Hornady engineers calculated exact drag versus velocity curves for each bullet in the 4DOF® database. Combined with the physical attributes of projectiles, the 4DOF® calculator is simply more accurate for long-range hits than using BC-based systems or drag curves based on limited data collection points.

The Hornady® 4DOF® Ballistic Calculator is free to use and available at hornady.com/4dof, or download the app from the Apple or Android app stores.