Can you confirm that? Or does the dps/accuracy between 35 and 40 stay linear like coh2db.com/stats shows?
The ability "range weapon modifier" is described as % since the accuracy value far would apply to the new range is should increase DPS from mid to far by around 14%.
Unless they have a rather weird way to apply the new range to only max range and the weapon fire at max range with the values of far.