In CS headshots were 400% of the weapon's base damage.
What is the headshot damage multiplier in Counter Strike Global Offensive?
My friend said it was 2.5 or 2.66666 or 2.8
I want to know for sure.
As of 13/Feb/2014 it is still 400% based on a quick read of the linked chart. http://www.schuzak.jp/cs-go/dmgchart.html