Bolt Action Rifle

Try to obtain a Weapon Lasersight Weapon Lasersight for the Bolt Action Rifle, almost eliminates all sway from the scope.
Silencer Silencer is best used for closer range engagements (200m~) Remove for longer range engagements (400-500m) and equip HV-5.56 Rifle Ammunition. (The reason you should remove the silencer for long range engagements is because it reduces the damage of any weapon by 25% AND your damage drops off on longer range shots. Your bullets will also lose velocity when using a silencer.
Equipping a silencer will remove bullet tracers completely, and bullet impacts are not as visible compared to not using a silencer on the Bolt Action.

LEARN BULLET DROP.
When it comes to fighting at longer ranges, especially against scientists (or players who make similar sporadic movements), bullet drop could be a total dealbreaker, even when using HV rifle ammo. The solution to this is to practice and be able to estimate the drop at certain ranges, then accounting for that by aiming upwards so the shots will drop directly onto your target. To make sure there is as little drop as possible, make sure there are no barrel attachments (as those dramatically lower velocity) and load your rifle with HV rounds. A laser sight and tactical gloves can reduce the sway without needing the suppressor.

Use incendiary rifle for the bolty a full health full metal with a head shot does 90 damage plus 19 bleeding