Is there a way to use scales that is not predetermined by SolidWorks?

Hi I am trying to change the scale on some of my drawings to better fit to an A4 size drawing, however when I select the costom scale my only real options for the particular part I am drawing is either 1:5 or 1:2 where idealy 1:3 would be perfect as 1:2 is just too large and 1:5 is just too small, is there a way to select scals between such pre-determined options?

Cheers,

Matt.-

SolidworksDrawings And Detailing