Find a good ballistics calculator and develop a drop chart for your load. I like the JBM calculator JBM - Calculations
. It is well proven and offers the different variables I like to adjust to find accurate click adjustment.
Once you have the chart, make sure you validate the settings at a number of distances. I have used a few different programs - some work and some dont. The only way to tell is to validate what they are telling you against actual field shooting.
Also, remember that if you shoot in an area with different inputs, your drop chart needs to be regenerated with the new information. Eg if you develop and validate a load in summer, then shoot in winter, or move to a higher altitude, the drop chart has changed. The further out the target, the more these variables matter. As you build your skills, you may find a handheld computer that lets you add the relevant variables in real time will be the most accurate way of calculating drop.