Having done this a few times, (also on a JP Sauer Drilling with 1 turret), can I suggest; make quite small changes and treat the screw slot like a hand on a clock face. So go from 12 O'Clock to 2 O'Clock, then test fire, then 2 to 4, and test fire again. You should get a feel for the amount of travel produced by each adjustment at the target end.
You also have to back off the corresponding screw if winding in. And take up the difference if winding out. Also, make a note in your reloader's log which direction the RH screw wound clock-wise sends the POI with each "2-hours" of adjustment. That way, when you come back to this rifle in a year's time, you'll know just what you did successfully last time, rather than waste ammo "reinventing the wheel".
Make sure the screw driver is a good fit both in length and that it sits deep in the slot and fills the whole slot width so you don't slip and mar the bluing. File to fit if necessary. Lastly, think about what you'll need to use to hold the rifle firm at the range while you do all this. A couple of sandbags, for instance, beats crushing it against a rough surface.
It's an OK system once it's set up. It's not a bad idea to find a load the gun likes first and then adjust the mount as different bullets will have different POI's both vertically and even horizontally and you don't want to be adjusting the mount too often.
