Export to coreldraw

I have been given a DWG file that I need to get into CorelDraw 9 which I
usually do by copy/paste special/ then resizing to the correct proportions.
However on this occasion I have been sent a strange shape and even when I
resize it with the ratios locked in Corel draw my dimensions are out by 1mm
( ie .5%)in one plane only. As I need total accuracy for this exercise is
there a better way to export from AutoCAD than merely copying?
Will newer versions of either of these programs make this conversion easier?