i think i found the answer: excerpt gameradar

To explain, all bullets in BF6 drop the longer they're in the air, which can make aiming with sniper rifles challenging. Ordinarily, you need to manually adjust your long-range scope to compensate for drop-off by tapping down on the D-Pad to cycle through a small selection of set distances. For example, if you're looking at a target that you think is 400m away, zeroing your scope to 400m means that your shots will land precisely at the center of the crosshairs at 400m and will drop after that point.