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Calculating Ballistic Coefficients

 

                                    
Bullet Based Calculations:
Ballistic Basics calculates mathematical bullet coefficients based on your inputs. 
These calculations should work for any shaped projectile, including round balls. 
These results will be most accurate with spire point/conical style bullets. 
For best results, use accurate measurements of length and width. 
            These calculations should only be used as a guide, as calculated BC's will not be as accurate as actual Chronograph data. 
            To use this feature, select Ballistic Coefficient (bullet based) from the Advanced Calculations Menu or the toolbar or press the Shift+F7 keys simultaneously. 
            In the new window add the caliper, bullet length and bullet weight values in the appropriate boxes, select the Bullet Type and Anticipated Velocity for non-spire, then click the Get It! button.  
The calculation will appear under the words:  Calculated Ballistic Coefficient.


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Load Based Calculations:
            To back calculate a ballistic coefficient select Ballistic Coefficient (load data based) from the Advanced Calculations Menu or the toolbar or press your Shift+F8 simultaneously. 
In the new window input the bullet weight and muzzle velocity. 
            Select for which yardage distance that you have a known known down range velocity of (100 yards would be the most accurate) and type in the known velocity. 
Click the Get BC button to calculate the bullet coefficient.

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About Bc's
            Most all of the Bc data you will encounter is based on the standard vacuum calculations. For most situations this is fine, however if you live say at sea level and you are planning a trip out west to the high Rockies, you may want to adjust your Bc's to those conditions. This will involve a little guesswork on your part or with a little effort such as calling a local airport in the area you will be hunting you can gather the required data.
            Ballistic Basics will allow you to Adjust the Bc's based on the assumed local conditions. You will need the following data:

Temperature
Barometric Pressure in "Hg
Relative humidity

You can get the standard Vacuum values by clicking on the topmost label.

 

            Once you have entered your data click OK and you will be asked if you would like to export the changed value to the main window.


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