When I shoot a target at 500+ meters, it takes 3-5 hits to kill it, even with torso hits or a headshot(!).
While the rifle zeroes max. at 1600m it's quite hard to hit anything, which might be OK (not sure if dispersion is according to specs), but IF you hit, the target should take more damage.
Maybe related to bullet speed.
Use Mk14 7.62mm to
Do the VR units wear body armor?
over 600m it is usually 2-3 shots in the torso when they got a body armor
max effective range is 800m and max range is 1000m for 7.62x51 , the 1600m is overkill for this round
To answer your question about VR and body armor: If you have a specific vest equipped the VR Copies it along with the armor it provides.