The Rubico has the highest critical damage multiplier of any sniper rifle, with a base multiplier of 3x.
On the other hand, it has a dismal status chance of 5%, being the lowest for all the sniper rifles. This is compared to the 20-30% of the other sniper rifles, a considerable difference.
It closely resembles the Grineer Vulkar in terms of damage type distribution and other stats; the main difference being the Rubico has higher critical stats, while having lower status, base damage, and magazine.
The Rubico requires only a single shot to activate its Shot Combo Counter, giving it an immediate 1.5x total damage multiplier on the first shot, and a 2.0x total damage multiplier after its third shot, giving it the ability to quickly ramp up its damage with a single magazine. On the other hand, it has a shot reset counter that lasts only 2.5 seconds, thus reloading will always reset its shot combo counter if there are no reload mods present.
With Harkonar Scope, it's possible to maintain the Rubico's combo through reloads, provided there is a target to hit within the allotted time.
Due to its high critical chance and damage multiplier, it is recommended to use Point Strike (bringing the weapon's critical chance up to 62.5%) as well as Vital Sense, which increases its critical damage multiplier to 6.6x. Hammer Shot and Bladed Rounds can increase this even further; up to 8.4x and 12.0x respectively. Scoping in also boosts its critical damage by up to +50% at maximum zoom level.