We were doing entry training from 120 knots all the way down to OGE hover in 20 knot increments. Those rates of descent were during entry training from OGE hover at roughly 6500 feet AGL. Zero airspeed in auto was demonstrated by pedal turns. I have no way to calculate the true ROD other than the IVSI was pegged.
At the bottom, we would end up with similar ROD's of 1400 to 1700 and airspeed of 60 to 80 depending upon what the instructor was asking me to work on.