I was playing king of the hill the other day, and someone was exactly 1800m away from me, no elevation at all. I zeroed in at 1800, and my shot ended up 3 MILDOTS BELOW THE TARGET. I was using the M330 LRR .408. I proceeded to go into the editor to test if this was correct.
I noticed that any range between 1200m-1900m was not zeroing correctly, by placing the target further and further away, starting at 100m, until I hit 1900m. I tried this with both the LRPS and the SOS.
Each interval of 100m between 1200m-1900m, the impact of the bullet was completely random.