9.3x57,
You were absolutely correct that the G33/40 (VZ33) is a small ring Mauser action. The Czechs profiled the left action rail to mimic the large ring action. I suppose this and the lightening cuts under the wood line on the sides were supposed to shave weight from the rifle. However, the difference in stock woods used might easily replace any savings of a few ounces. They did not however decide to do this on the 21/22 series of rifles and left the left side rail full thickness - go figure?