SVDS + 7.62x54mm R BT gzh accuracy [bug]

Doing punisher 6 mostly from Reserve dome and find that BT (the gud stuff with 78 damage 55 pen) will hit anything EXCEPT what I am aiming at.

March 3-24x42 scope zeroed to the RAPTAR readout works perfectly with T46, LPS and SNB ammo from 100 to 300 meters.

I see the weapon is calibrated with PS ammo (which I cant buy until Punisher 6 is done), but since all the other ammo manages to hit aimpoint, WTF is up with BT ?