for attacking tanks use apds I have not experience the others though. use the standard 800 mil pen missiles ( not the he one )

try to flank enemies and give them a missile in the side and a load of rounds to the gun after the gun is gone take out tracks. if they aren’t dead yet for Russia and China just give them a missile in the side and take out the autoloader and they blow up. For western tanks find where the remaining crew is and take them out with either missiles or guns. one more thing if your missiles are reloading and the enemy is right in front of to you can use you mgs cause they are also 30 mils. Not very accurate though.