Heruon: I have been told that on certain modded weapons the POA/POI is different and seems to emulate this better (in particular the HK 417 from the R3F pack). However, I JUST tested this using the default guns in the current stable release.
At 100m POI seems to be slightly higher, but not much (about what it should be for 200m. At 200m it is poa/poi. At 300m it is POA/POI, and from here the BDC accounts for accurate drop.
We should be seeing, with a 300m zero, in the case of a 5.56x45 62gr m855, a variance of about 5inches at 200m. This is not reproduced.
Get 200m away from a building. Use windows as a xy axis. Shoot. Move to 300m. Shoot. The poa/poi is almost identical.
The heavier the round, the more drastic the arc. A 6.5mm round would be hitting even higher.
Also note, if the Devs had this implemented they probably would have said so by now stating that I'm crazy.
Whether or not there IS an arch, if there is, it is negligible compared to a true ballistics arc. I should not be able to shoot, and hit a target at 200m in the head poa/poi with a 6.5mm round.
If you truly want to test this, you must use the ARCO. The TIP of the chevron is the 100m mark, Middle is 200m, and center is 300m.