PBX
Portable Ballistic Xtrapolation


Load Screen


Bullet Weight: Weight of the projectile in grains.
Ballistic Coeff: Enter the value listed in the manufacturer's data book.
Drag Function: Select from the drop-down box. The function must be the same one used by the manufacturer to obtain their ballistic coefficient.
Velocity: Enter the velocity of the projectile in feet per second. This data can come from the loading manual, but the accuracy of the model will degrade if not measured.
Chrono Dist: If you are measuring the projectile's velocity with a chronograph, enter the distance from the chronograph to the muzzle. Otherwise, enter 0. This measurement is in feet.
Sight Height: This is the height of the scope above the bore in inches. The measurement is made from the centerline of the scope to the centerline of the bore.
Zero Range: Enter the distance the rifle/pistol has been "zeroed" at. This measurement is in yards.
Height @ Zero: This is an offset for projectile impact upon the target. If you want the projectile to strike the target 1 inch above the bullseye, enter 1. This value is in inches.
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