Fri Oct 08, 2010 2:27 pm
The quick answer: Yes. Milling twice will raise the efficiency in that the grain will be in smaller pieces, exposing more of the starchy insides to the water and enzymes. On the downside, if by milling twice, the husks are ground up too small you run the risk of getting some astringency from the husks plus the risk of a stuck sparge. Rice hulls will take care of the stuck sparge risk, but the astringency is there to stay. Take a look at the crush. If the husks are still in pretty large pieces you are safe.
It sounds like someone else is having efficiency problems with the crush from the mill shop so a second time through the mill may be called for. If you go for a second pass, just have them run about a pound through first. Check the crush, especially the husks to determine if you want to remill the rest.
Wayne