I dont care now
Only thing i need to know is
Ap t
Fi t
Difference
Which one is for infantry which one is for weapons
Armour Piercing-Tracer penetrate target while Fragment Incendiary-Tracer explode on impact. AP-T should be used against Tank, FI-T should be used against infantry, light vehicle such as jeep, and planes. But currently there is a bug caused sometimes explosive rounds (FI-T) make less damage to planes than expected, so for that you may decide from your own experience.