JBM Small Arms Ballistics
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A new topic, Elevation, has been added. It shows the differences in trajectories when zeroing at different atmospheric conditions and how to calculate a trajectory for different atmospheric conditions.


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JBM - Calculations - Trajectory (Basic)

This calculator provides a simpler input to the point mass trajectory program. Many of the lesser used input variables have been removed. Input variables include muzzle velocity, atmospheric conditions, angles, ranges, sight measurements, ballistic coefficient, drag function and various options. Explanation of terms.

Library -- Select bullet or enter BC and Weight below.
Ballistic Coefficient [Links](0.010-2.0) [0.5]
Bullet Weight (10-15000 grains) [220.0]
Caliber (0.1-2.0 inches) [0.308]
Muzzle Velocity (500-4500 ft/sec) [3000.0]
Sight Height (0-100 inches) [1.5]
LOS Angle (-90-90 degrees) [0.0]
Cant Angle (-90-90 degrees) [0.0]
Wind Speed (-100-100 mph) [10.0]
Target Speed (-100-100 mph) [10.0]
Minimum Range (0-1999) [0]
Maximum Range (1-3000) [1000]
Range Increment (1-2000) [100]
Zero Range (1-2000) [100]
Temperature (-40-140 °F) [59]
Pressure (15-40 inches Hg) [29.92]
Relative Humidity (0-100%) [0]
Altitude (-1000-15000 feet) [0]
"Energy" Column
Drop Units (First Column)
Drop Units (Second Column)
Standard Atmosphere at Altitude Corrected Pressure
Elevation Correction for Zero Range Azimuth Correction for Zero Range
Ranges in Meters Drop and Windage Relative to Target
Zero at Max. Point Blank Range

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JBM Small Arms Ballistics. Last update 22 April 2008, Copyright © 1996-2008 JBM [V]