My sense is the rail is not quite right on my rifle. The Millet rings sat right on the rails, pulled down firmly by the clamps they way they ought.
The mount alignment did not hold the scope axis low enough; could not get the group up to the bull.
The CZ rings pinch into and align on the slots on the side of the rails. They do not sit on top of the rails firmly (you can see a little light under them). The mounts put the bull at 100 yrds within range, with enough verticle range to zero at 200 if I like.
I don't feel it is a fault of Millet -- just quirky rifle. I have read of a number of folks having problems with different rings; my sense is its best to try a few and see if any work.
Dan