Trajectory Input


[JBM] [Ballistics]

Instructions

Enter your data in the areas provided below. Select the "Calculate" button when all fields are filled. Wind direction is perpendicular to the line of sight, positive values are to the shooter's right. If the Chronograph distance is greater than zero, the muzzle velocity is corrected for this distance. If the field is blank, the default (shown in brackets) is used.

Explanation of terms.

Muzzle Velocity

Muzzle Velocity (500 to 10000 ft/sec) [2600.0]

Chronograph Distance (0 to 100 feet) [0.0]


Bullet

BC ( links), (0.010 to 2.0) [1.0] (Give BC's in order of increasing velocity ranges, start with the first line, don't skip any lines, and give zero fps for the last BC.)
BCmax fps
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
BCmax fps
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.

Drag Function [G1]

Bullet Weight (5 to 70000 grains) [750.0]


Sights

Sight Height (-100 to 100 inches) [1.5]

Sight Offset (-100 to 100 inches) [0.0]


Wind

Range Wind Speed (-100 to 100 mph) [0.0]

Vertical Wind Speed (-100 to 100 mph) [0.0]

Cross Wind Speed (-100 to 100 mph) [10.0]


Angles

Azimuth (-300 to 300 MOA) [0.0]

Elevation (-300 to 300 MOA) [0.0]

LOS (-90 to 90 degrees) [0.0]

Cant (-90 to 90 degrees) [0.0]


Target

Speed (-100 to 100 mph) [10.0]

Angle (0 to 180 degrees) [90.0]


Zero

Range (10 to 10000 yards) [100.0]

Height (-100 to 100 inches) [0.0]

Offset (-100 to 100 inches) [0.0]


Ranges

Minimum Range (0 to 9900 yards) [0.0]

Maximum Range (100 to 10000 yards) [1800.0]

Range Increment (1 to 1000 yards) [100.0]


Options

If correction for azimuth or elevation is chosen the entered values (above) for azimuth and elevation are ignored.

Elevation Correction for Zero Range
Azimuth Correction for Zero Range
Firing solution table mode

In firing solution table mode, each row is a distinct trajectory striking the bull at the range of that row, and the computed elevation is the correction to make relative to the user-specified scope zero above (+ means higher, - means lower). Select an angular unit below; results in inches are not particularly useful.

Drop and Windage units


Atmosphere

Temperature (-40 to 140 degrees Fahrenheit) [59.6]

Pressure (15 to 40 inches Hg) [29.92]

Relative Humidity (0 to 100%) [78]

Altitude (-1000 to 15000 feet) [0]

Checking standard conditions at altitude cause the temperature, pressure and humidity to be adjusted for the given altitude, otherwise the air density is calculated from the temperature, pressure and humidity using the ICAO Standard Atmosphere.

Standard conditions at altitude