I forget the hitboxes for this game

Mostly in snipers. I used to be able to go 23 and 2 in team snipers, with 21 head shots (always aim for the head)

Now after coming back to this game I’m lucky to get 3 headshots, seeing as how my aiming has evolved over the new games.

So, remind me, what are the hitboxes like in this game? Where does it register as a headshot so I know when to pull the trigger? Is there a diagram that I could look at? Thanks in advance (: