I tried every method, every monitor distance percentage I've been here since 3 years. Only method I like to use is %100MDV for Y %100 MDH for X axis from windows to game. Sadly most of games doesn't have vertical multiplier support. I recommend everyone to try this method in games like cs:go quake champions, quake live, Team fortress 2, pubg, rainbow six
EDIT: USE %0MDV For scopes.