For all practical purposes, I move the decimal two places to the left on the range distance and divide this into the number of inches of drop and multiply by .955, this will be real close if your scope is calibrated to true moa.
Using a chronograph and a 4’x8’ sheet of plywood standing on end using the top edge as an aim point will help you get a drop chart out to 600 or 700 yards depending on the MV and BC. When you are all done you have the data to get a drop chart from any program to go out farther. If you know the average velocity for each group shot, you will be able to modify the BC on the program to make the trajectory fit your data, this BC is the one you should use. Take good records of the temp and elevation especially, BP and humidity are somewhat less important, humidity especially.
I like to do this at 20-30 degree temperature swings to record velocity drop along with new zero data too. Velocity at different temps will be very important if your powder is not too stable, which a lot of them are not.
The important thing to establish and record for a drop chart is what moa "your" scope indicates when zeroed at each range interval you've went back and verified using the method of dialing it in. Sometimes this takes some time to nail down here.
Thanks, one thing I forgot about was the 1moa=1.0467" @100 yrds. When shooting short range < 600yrds. its just easier to figure 1moa as 1", but as the distance increases, so does the margin of error.