I tried it my self, I literaly tested it, and overtesting = ban LOL! but thats about that cap 70-75 kills for Kill Confirmed (dont always do headshots) with MOAB activated at 25 kills + these killstreaks with support, Counter UAV, Advanced UAV and EMP.
Then in TDM, I tested it again, I had the same killstreaks (C-UAV, Advanced UAV and EMP). By the time I got my 12th kill (advanced UAV) I told my dier to kill me. then by 15 kills the game will end and you will get all the XP. Btw you can get All headshots in this game if you want.