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There is two calculators in the app. One needs the Horndy tested data, the other is your run of the mill BC based where you enter your BC data manually.
You then select whatever profile you want to run. The wind, distance are wheels for lack of a better term. You drag them up or down to change the value - except distances can also be entered directly.
In the 4DOF there are not a lot of non-Hornady profiles, so much will be manually BC based.
Set up your log in - here is the main page:
Click on Favorite- the the + button to add rifle data in either the 4DOF or BC listing
Standard BC above 4DOF below
Click on the profile to edit or copy.. enter or change data
Click on Bullet to find if one is listed in the 4DOF
Add rifle // load data
Save and click “Select” to load the rifle data into the solver
Change conditions and used the slider wheels to change distance and wind
Click on view full table, enter resolution then the table will be displayed- scroll down and left to right for more info