Your scope as mounted has a certain range of adjustment and you are in that range or out of it regardless of where in that range you startfrom. Think about it.
If you start with a scope that hasthe windageadjustment screw adjusted all the way to one side,then use your base windage screws to do a rough zero,you may not have enough adjustment in the scope to fine tune the zero.If you start with the scope windageadjustments in the center of the adjustment range and rough zero with the base windage screws,you will have plenty of adjustment left for fine tuning.