This weapon can kill targets in three body shots or two head shots. However its permanently affixed swaying scopes render it hard to use and awkward. It is advisable to save up for the M77-B or TSAR-42 rifles if you want a proper one-shot one-kill rifle.
Using this weapon requires a great change in playstyle in order to make it effective.
Play as if you are using a long range assault rifle, fire a couple of rounds at the enemy- if they aren't dead, don't bother to finish them off. Or else someone else will take you out before you duck behind cover.
Double headshots are viable, but are difficult to pull off. Unless you are dealing with a shielded heavy assault, aim for one headshot and a single body shot instead.
Fire 2-5 rounds at a time before repositioning or cloaking. DO NOT OVERREACH THIS LIMIT. You are already exposing yourself for too long after a 5th shot, it is not worth the kill.
Flanking enemies with this weapon is surprisingly devastating- the fast fire rate along with a fast reloading magazine will allow you to kill several adversaries in rapid succession.
Compared to bolt actions, the 99SV has greater potential against multiple targets.
The 99SV has very high bloom values. About .8 per shot. That is 16 times more bloom than a standard assault rifle. Only spam the trigger within 30 meters at most. Any further and you must let the weapon settle after each round fired.
The unscoped equivalent is the KSR-35, which has a slower muzzle velocity in comparison.
It is possible to get both Ribbons and Medals for using the 99SV. Each Ribbon is a standard reward for achieving a set amount of kills with the 99SV. Medals relate to how many overall kills you have with the 99SV.