Protein Scales Protein Scales Spring wheat protein scales -.02 ea. 1/5 under 14 pro to 11 pro. +.02 ea 1/5 over 14 pro to 16 pro. Winter wheat protein scales -.02 ea. 1/5 under 12 pro to 9 pro. +.02 ea. 1/5 over 12 pro to 14 pro.