I feel the same, i have been 3-shotted with the BR on a number of occasions, even from distance, yet i can aim at the head (as best i can

) and shoot 7-8 times before they drop. Yesterday i had a few occasions where i shot a person standing still multiple times in the head, on one occasion 6-7 times (without any lag that i noticed), before they died, what gives?
Same thing with the carbine. Yes it's possible that i am just missing, but when the target is stationary and i don't move my xhair from their head, and they still take 6+ shots to go down (from medium range)? It's weird.