The Overture revolver is supposed to have a special attribute that increases the kinetic energy of its bullets by 6 times, which should throw most enemies of their feet. However, it doesn't seem to work, the gun has no more impact on enemies than other revolvers.

Maybe i missed something but where did you come up with thius special attribute ?

It was already in the description of the gun (not a mod).

Only iconic weapons have special properties.