Heat 7.9 gal tap water to 157° F. Add grain and mash at 152° F for 60 minutes, stirring every 20 minutes. Remove bag and let drain while starting boil. Boil for 70 minutes. Chill to 68° F, oxygenate and pitch yeast. Let fermentation temperature rise naturally up to 74° F. After 10 days, rack and let condition for another 10 days. Bottle using dextrose to 2.5 vol. CO2.