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 damage bonus on the first shot, and a 2.0x damage bonus 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.
Due to its high Critical damage multiplier, equipping a maxed Vital Sense would be beneficial, putting the critical multiplier at 6.6x critical damage modifier. Stacking Hammer Shot on top would bring it to an 8.4x multiplier. Scoping in with maximum zoom level is also excellent at boosting its critical damage by a sheer number, as its innate boost to critical damage when scoped in will effectively increase its damage if it procs a critical hit.
To trigger the high crit multiplier more often, it would be recommended to put a maxed Point Strike on, bringing the weapon's critical chance to 62.5%.
The word rubico has its roots in the Latin word for red, rubeus.
Despite this, the Rubico is mainly green, with small red accents. Its naming may come from the fact that it requires a decent amount of Rubedo.
It seems as though there is a chance for a bullet to not hit its mark, even when scoped in. Currently it is unclear whether this is a bug or a feature.