There was a great Thread dealing with POI and I cannot find it. If you can find it, I would appreciate any information you have.
It included some mathematics regarding measuring the rib height at each end of the barrel and then determining the height difference between center bore and rib height and the corresponding angle between those two data points. Result allowed you to calculate the delta at 40 yards between your POA and your POI.
Thanks in advance for any assistance you can provide.
Cheers, Dusty