I just had some time today and tested BRM-1 they definitely are inaccurate 80% are missing target. they hit behind and after 180 turn i cant get point track any more
edit:
new discovery against btr-80 i hat 100% hit rate so its possible it has to do with just some ground unit
edit2:
after more testing its look like most tanks have some "laser jammer"
test all modern tanks