I do work with the WA, the key is to not hold your breath and theres like no recoil. Here's the only 5 sniper setups you should use:
Barrett/Intervention with stopping power
WA with anything but stopping power
WA silenced with stopping power
M21 stopping power
M21 silenced anything but stopping power
When you use a silencer and stopping power they cancel out, so its the same damage as no stopping power no silencer. Barrett and intervention are 1 hit kill everywhere but limbs with stopping power, without stopping power 1 hit kill head and torso. WA is a 1 hit kill to head and torso regardless of stopping power, so either use cold blooded/hardline or silence it and use stopping power for the 1 hit kills. m21 is 1 hit kill with stopping power to head and torso, without just the head. Silencing a barrett or intervention is stupid because you get the same 1 hit kills as the WA, and the WA has less recoil. M21 can be used with stopping power so its the same as the WA with less recoil and more ammo and larger clip, or if you silence it don't use stopping power and just always go for 2 hit kills
dropping some knowledge