IMO gap is over rated unless you're making flour. Different grain is going to grind differently, and what matters is size of endosperm chunks and state of husk. On the BZg4, you want pretty in-tact husks. There may be a worst-case endosperm crush that causes plugging, but I haven't seen that issue personally.
Bottom line is: If not using a bag, look at your crush and adjust to keep husks in good shape. Maybe start at 0.035" but be prepared to adapt to the size of your corns and the dynamics of your mill.
Bottom line is: If not using a bag, look at your crush and adjust to keep husks in good shape. Maybe start at 0.035" but be prepared to adapt to the size of your corns and the dynamics of your mill.