How to Remove "Ammo Recieved"

Hey, so you guys know when you kill someone in single player and you grab thier ammo, and in a circle (for example “SMG Ammo:45”) pops up, how can you get rid of that? I tried cl_drawhud 0,hud_deathnotice_time, and 0hud_saytext_time 0 but none of those worked, although it did remove everything else. I wouldn’t mind so much except for that fact that I’m making a machinima. (yes it will probably suck, but deal with it.)
Thanks for the help!