Instructions:

Enter the appropriate data in the spaces above and click the calculate button in the upper window. Default values are provided in all of the spaces just change the ones you want. A range table will then be displayed in this window. The inputs that are less likely to be changed are located under the calculate button in the upper window.

Inputs:

  • Velocity = Muzzle velocity in feet per second (must be less than 4400 fps)
  • Bullet Wt = Bullet weight in grains (must be at least 10 grains)
  • Sight in at = the range the gun is sighted in at in yards
  • Ball Coef = Ballistic coeffient (must be at least .005)
  • Sight Ht. = Height of sights avove bore
  • Intervals = Intervals at which table displays data in yards (must be at least 5 yards)
  • Mx. Range = The longest range displayed on table in yards (cannot be more than 1000 yards)
  • Muz Elv = Horizontal inclination of gun in degrees (should be between + or - 60 degrees for best results)
  • Temp = Temperature in degrees fahrenheit
  • Altitude = Feet above sea level
  • Wind mph = Wind speed in miles per hour
  • Wind dir = Wind direction in degrees (0 is downrange 90 is directly cross range)

The table will display:

  • Range
  • Remaining velocity
  • Point of impact in relation to aiming point
  • Total drop
  • Time of flight
  • Remaining energy in foot pounds
  • Wind drift (Default is 10 mph cross wind)

If you do not know the ballistic coeffient of the bullet you are using you can enter the bullet diameter in decimal inches (for example a 30 caliber bullet is .308 inches in diameter) and the bullets weight into the boxes on the left and select the bullet shape from the choices provided. When the Calculate button in the left hand box is clicked the program will give an estimate of the ballistic coeffient as well as the exact sectional density.

For most bullets these estimates are extremely close to what has been measured by the manufacturer, but sometimes they are not. The BC of any given bullet will vary with the speed it is traveling, this is especially true of handgun bullets which are not very aerodynamic to begin with. If you need to know the exact BC of a specific bullet you will need to get that information from the manufacturer.

To generate a new table just enter new information into the input boxes and click the calculate button.