Two U.S. wheat classes, hard red spring (HRS) and hard red winter (HRW), were collected from export cargos by the Federal Grain Inspection Service (FGIS, Portland, Oregon). Protein contents of HRS and HRW were 15.56 g/100 g and 13.45 g/100 g (dry basis), respectively. The two samples were conditioned to 16 g/100 g moisture and milled into flour on a pilot-scale Miag Multomat mill (Buhler, Inc., Braunschweig, Germany) at the Wheat Marketing Center (Portland, Oregon), with straight-grade flour extraction rate of 71.63 g/100 g for HRS and 70.42 g/100 g for HRW.