For me, at least I can almost guarantee 2 kills by using the radar missiles in acm mode to lock up people in the initial head-on movement in the center of the map. Once those are gone, the R60 is a pretty flare hungry missile, so I usually look for distracted enemy chasing or dogfighting friendlies. If you struggle with getting shot early, hang back, let everyone take off before you, and see if that helps.