I think the 30nm or so claim is pretty accurate since it is reflected in the MLU manual, and there is other evidence aside from things like minizap to back it up, but I won't go into that.
Mind you 'range' is a very elusive thing because people like to define it so differently ...
For example, everyone is familiar with the 'yeah, that's the range is it goes straight and does nothing at mach 1 and 45000' ... but have you considered, what does 'it can hit the plane at that range' mean?
Does it mean the missile has slowed down to that aircraft's velocity? Does it mean it is still controllable? Does that mean it's reached minimum controllable airspeed? What speed is that?
So yeah. Maybe if you drop an R-73 from 40km it will go just that far ;D