There are different states and formations of Thargon Swarms, and that's the reason sometimes you can't kill them even with good aiming. Distance is also
important - usually it's successfull at 4 - 6 km, when they are closer they will change direction often and you will miss. Take a look at https://wiki.antixenoinitiative.com/en/thargon-swarms
important - usually it's successfull at 4 - 6 km, when they are closer they will change direction often and you will miss. Take a look at https://wiki.antixenoinitiative.com/en/thargon-swarms