I guess I should make it clear what the target set up for that sighter target was.

I stapled two 8" "orange peel" targets in line, one over the other, after I realized that I wasn't hitting the one I was shooting at. After shifting the point of aim twice, I found that by taking a 6 o'clock hold on the BOTTOM target, I was close to the bullseye of the TOP target. So the rifle hits about 12-13" high @ 100 yards with the rear sight bottomed out at the "1.5" setting.