I carry a 54/10 and a 58/8.  I seldom use the 58.  Does anyone know if playing a wedge, face wide open, significantly increases the loft?  If so, is there a rule of thumb?  Is 5 minutes of face angle worth 2 degrees loft, for example?  I looked all over and most sites speak about changes to the effective bounce.  They are vague, however, regarding specific changes in effective loft.  I think it would be instructive to know what to expect…all else being equal as possible.