Maybe that's wrong, just what I have been told.
Usually, when I encounter a loose scope ring set, meaning rings are adequately tight on the scope, but not on the base, the scope has moved forward... not always, just more often than backwards.
I don't imagine that would be some hard, fast rule of physics, so I see no reason not to try it either way. I'm more concerned with the return to zero, so the repeatable stop element is more the issue in my mind.
I use torque screwdrivers, good rings and proper preparation on my own guns, so when I do run into loose rings, it's at the range or a hunt on other people's guns. It's amazing some of the stuff you run into.