We have never used the automatic freight calculation before, but I'm testing it out.  I have an item number set up as weight = 2.  When I have qty 1 on my SO, the Ship Weight comes out to "00010", and if I change the qty to 20, the Ship Weight comes out to "00028".  Under Sales Order Options, I have Use Shipping Code to Calculate Freight = Actual.  What could be going wrong here?  Thanks!