Really, I just wanted you to explain the difference between the above things, but you have in fact just said they are the same: I think therefore the mixup involves my using the term 'zero' to describe the
setting of the sight and your using it to mean a
distance from the muzzle (in fact, you are using the further of the two such points) at which the POI and the POA coincide.
I often set my zero on a 100yd range. Generally, I know I get a good point-blank range for the hill by
setting zero at 2" high at 100yds. Further field-testing then allows me to find out the
distance at which the rifle is zeroed.
It is clear that if your say your AI is zeroed at a
range of 200yds, that the z
ero (meaning the
the setting of your sight) is such that the POI is 1" high realtive to the POA at 100yds.
Pax.