Captain Vor's prized Orokin-Grineer hybrid pistol has an average rate of fire but it has high damage and superior zoom capabilities.
The Seer is an accurate, heavy pistol of Grineer design utilizing Orokin technology, creating a unique hybrid weapon. It features innate magnification for aiming and a high damage per bullet but has a low muzzle velocity.
Use it for stationary mid-long range targets (or easy to track targets), the bullet travel time and the gun's slow fire rate makes it hard to use on moving targets and for some reason it misses extremely close targets.
When using multishot mods you can decrease the spread of the extra shot(s) by zooming in, or fire from the hip to increase the chance of headshots (as the multiple shots will spread out slightly)
The Seer has reasonably strong recoil when zoomed in. Consider using Steady Hands to make it more controllable; when maxed out, the Seer's recoil should be almost completely unnoticeable.