While Unclenick works on the illustrations, let's look at an easier puzzler, shall we?
Real story. The turret wheel of my scope wore out. Clicks had become mushy. I fixed it with some epoxy creativities. But in the process I lost the zeroing. I was eager to shoot next day, so I did the barrel sighting in the garage in the middle of the Sunday night.
I picked a screw head on the garage door as reference point. The scope was mounted on an AR upper 5 yd away. Bore on the screw head. Cross hair on the screw head. Good to go.
Next day. Target was a 24"x24" cardboard 100yd away. I knew the it was going to hit high, so I aimed at the lower edge of the cardboard. 3 rounds, all off paper. Dust on the berm showed poi way high. 40 - 50 moa high.
Why does it shoot so high? I used the same trick to bore sight my Remington 700 in .30-06. It was on paper, even it kicked much harder than 5.56.
What happened?