In maximus the QRS says a SUG shoots at full effect at 3 deep, reduced at 2. Does this get further downgraded at 1? I used a skilled unit of archers 1 deep the other day and 6 white dice felt quite a bit more powerful than 2 green.
A SuG (with exceptions such as artillery) 1 deep does not shoot at all. Page 157.
It doesn't say they don't get to shoot at all on page 157. It just doesn't say anything about shooting in one rank, which is not the same thing. If it is the case I think maybe it should be clarified.