Predict where your enemy will show up and keep your cross hair there as you move / turn around the cornet
Keep your cross hair at upper chest level for regular recoil, lower for high recoil but with up and down spread, and neck for low recoil
I aim above the player, and start shooting (with scope in).
I can usually control the recoil pretty well so when I drag my mouse downwards, I get a 90% chance headshot.
Let you opponent put himself into the crosshair if he is moving away or something, if you keep moving to aim, you won't hit him well enough.