This is normally how we do it as well. However, this method is no longer practical (for us) due to the tighter constraints imposed by ASTM. The 48-52% saturation has forced us to sometimes conduct 3-4 trials before we get it right. Since each test requires a min. soak time of @ least 24 hrs...
As of 2008, the % saturation must be 48-52% to be considered a legitimate test as per ASTM, as they no longer allow the use of a correction factor. The % saturation equation has basically two (2) variables (excluding SG), % moisture & dry unit weight. Aside from running a proctor (=extra time...