I'm having problems using Projection to apply a Decal.  Please see screen shot below.

I have just extruded a rectangular prism and trying to use Projection to Face 2 for applying a Decal. But you can see how small the actual decal (R) and it is offset to the side. What am I doing wrong. Face 2 is 50mm x 29mm in side, so the (R) should fill the whote face. 

When I use Label option for mapping it works