I needed an inductor for a signal filter, very low current. I have some small common-mode chokes. I measured the winding inductances as 1.7mH each, thinking I'd get 4 times this with the two windings in series, but that only measures 3.2mH, a bit less than double (or zero if the windings are connected opposing).
This happened with a few different value CM chokes, all similar to KEMET SC-02-200.
I know that CM chokes aren't designed for this, but can they really be saturating at whatever small level my meter uses, or is there some other explanation?