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JBM - Calculations - Trajectory Card

Calculate a trajectory card from bullet, velocity, firearm and atmospheric parameters. Density is calculated using input density altitudes. Muzzle velocity is found by using linear interpolation between two velocities measured as a fuction of temperature.

Explanation of terms

Notes (displayed at top of printout) [?]
Library (Select bullet or enter BC and Weight below) [?]
Ballistic Coefficient [Links] (0.010 to 2.000) [0.5] [?]
 Bullet Weight (5.0 to 15000.0 gr) [220.0] [?]
Caliber (0.100 to 2.000 in) [0.308] [?]
Bullet Length (0.100 to 4.000 in) [1.5] [?]
Low Velocity (500.0 to 4500.0 ft/s) [2750.0] [?]
 High Velocity (500.0 to 4500.0 ft/s) [2800.0] [?]
Low Temperature (-40.0 to 140.0 °F) [32.0] [?]
 High Temperature (-40.0 to 140.0 °F) [70.0] [?]
Distance to Chronograph (0.0 to 100.0 yd) [10.0] [?]
Sight Height (-100.00 to 100.00 in) [1.5] [?]
 Sight Offset (-100.00 to 100.00 in) [0.0] [?]
Line Of Sight Angle (-90.0 to 90.0 deg) [0.0] [?]
 Cant Angle (-90.0 to 90.0 deg) [0.0] [?]
Barrel Twist (2.0 to 100.0 in) [12.0] [?]
 Twist Direction [?]
Wind Speed (0.0 to 100.0 mph) [10.0] [?]
Zero Range (1 to 3000 yd) [100] [?]
 Zero Height (-100.00 to 100.00 in) [0.0] [?]
Zero Offset (-100.00 to 100.00 in) [0.0] [?]
 Zero Altitude (-4000.0 to 15000.0 ft) [0.0] [?]
Zero Temperature (-40.0 to 140.0 °F) [59.0] [?]
Drop Units (0.050 to 10.000 MOA) [1.0] [?]
 Windage Units (0.050 to 10.000 MOA) [1.0] [?]
Ranges (Comma separated list of up to 50 ranges. Units are the same as the zero range) (0 to 3000) [?]
Temperatures (Comma separated list of up to 10 temperatures) (-40.0 to 140.0 °F) [?]
Altitudes (Comma separated list of up to 10 altitudes) (-4000 to 15000 ft) [?]
Show Drop and Windage Deltas [?] Windage Correction for Zero Range [?]
Include Only Notes in Header [?] Target Relative Drops [?]
Round Output to Whole Numbers [?] Include Spin Drift [?]
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