Made this a while back based on the swathes included in Luftwaffe Markings and Camouflage 1933-1945 which is like an authority on the subject.
RLM 74, 75, 76 was the combination of greys that was used most often from 41-44.
RLM 76 had a tendency to fade though
Also RLM 71 (or 70 I don't honestly remember) was used on the spinner, not black, and RLM 21 & 22 were glossier than other colors
