| Ballistics Calculator Help |
| Bullet Diameter
| The diameter of the bullet as provided by the manufacturer.
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| Bullet Weight
| The weight of the bullet as provided by the manufacturer.
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| Ballistic Coefficient
| Ballistic Coefficient (BC) to either the G1 standard or the G7 standard. If both G1 and G7 data are provided, it is best to choose the G7 value for HPBT type bullets.
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| Zero Range
| This is the range at which your rifles Point Of Aim (POI) equals the Point Of Impact (POI). A Zero range of 100 yards or meters is encouraged for several reasons, including insensitivity to atmospheric conditions, and accounting for inclined fire effects.
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| Sight Height
| How high the scope centerline is above the bore centerline. This is typically between 1.5" and 3.5".
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| Muzzle Velocity
| How fast the bullet leaves the rifle as measured by a chronograph. For very accurate results, remember to account for the velocity lost in the 10-15 feet between the muzzle and the chronograph. As a rule of thumb, a bullet looses 5-15 fps in this short distance.
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| Temperature
| The atmospheric temperature. Because there is a great sensitivity to atmospheric temperature, it is recommended that this data be provided by using a local weather station or handheld weather meter.
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| Altitude
| The altitude at which the shooter is at. The ICAO standard is used to find the standard atmospheric pressure at the given altitude and temperature.
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| Wind Speed
| The absolute magnitude of the wind speed.
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| Wind Direction
| The direction in which the wind is coming from in terms of clock hands. Example: If the wind is blowing from the left to right and slightly into your face, it would be 10 or 11 o'clock wind.
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| Inclination
| This is the uphill or downhill angle to your target and is measured with an inclinometer (angle indicator). The value will be positive for look-up angles, and negative for look-down angles. Small look angles, like less than 5 degrees can typically be ignored with little consequence even for long range shooting. If the angle exceeds 10 degrees it becomes increasingly important to account for.
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