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 Card

This calculator provides a point mass trajectory and maximum point blank range. Input variables include muzzle velocity, atmospheric conditions, angles, ranges, sight measurements, ballistic coefficient, drag function and various options. Explanation of terms.

Notes (displayed at top of card)
Library -- Select bullet or enter BC and drag function below.
Ballistic Coefficient [Links](0.010-2.0) [0.5]
Bullet Weight (5-15000 grains) [220.0]
Caliber (0.1-2.0 inches) [0.308]
Muzzle Velocity (500-4500 ft/sec) [3000.0]
Chronograph Distance (0-100 feet) [10.0]
Sight Height (0-100 inches) [1.5]
Sight Offset (-100-100 inches) [0.0]
Azimuth (-300-300 MOA) [0.0]
Elevation (-300-300 MOA) [0.0]
Zero Height (0-100 inches) [0.0]
LOS Angle (-90-90 degrees) [0.0]
Wind Speed (-100-100 mph) [10.0]
Target Speed (-100-100 mph) [10.0]
Zero Range (1-2000) [100]
Ranges (comma separated list of ranges)
Temperature (-40-140 °F) [59]
Pressure (15-40 inches Hg) [29.92]
Relative Humidity (0-100%) [0]
Altitude (-1000-15000 feet) [0]
Vital Zone Radius (2-100 in) [5]
Drop Units (First Column)
Drop Units (Second Column)
Elevation Correction for Zero Range Azimuth Correction for Zero Range
Standard Atmosphere at Altitude Corrected Pressure
Ranges in Meters Zero at Max. Point Blank Range

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