The 12 o'clock position screw handles the elevation change and the 3 o'clock screw handles the windage change. By how much? I have no idea. I had to approximate mine when I zeroed mine in. As in turn the screw 1/2-turn and the point of impact moved so many inches at 25-yds.
I have an indoor range close to me that is 100 yards. I sighted it in at 25 to get it started then moved it out to 50 which was pretty much perfect for my purposes w/ this carbine. Learned the hard way to use the "adverse" setting w/ bulk American Eagle .223 . I do wonder if there is any downside to using the "adverse" setting often.