I generally get 85% BHE. I don't use much MO so I don't have a good established extract rate for it. Every sack could be different. I would expect 5.5 gallons of 1.057 wort. Anywhere from 1.055 to 1.060 would be fine. Mash temp should not matter for OG, but then hitting the FG is even more important than the OG anyway.