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Vital Zone size is required to calculate PBR
Near Zero: %.2f yards
Far Zero: %.2f yards
Minimum PBR: %.2f yards
Maximum PBR: %.2f yards

Sight-in at 100 yards: %.2f" high
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balistica
External ballistics software
balística is a basic ballistics calculator for the Gnome Desktop Environment. It provides the ability to calculate the standard drag functions (G1-G8) along with other minor ballistics related calculations like the Greenhill Formula and the Miller Twist Rule.
balística’s features include:
Calculate a round's drag using the G1-G8 drag models
Compute a bullet's twist rate using Greenhill or Miller
balística
External ballistics calculator
ballistics