Ah, yes Guy. Maybe we are in search of the lost chord! Although, for those in the know, that could well show the age of my record collection.
For my part, I've yet to find a PC10 straight from the tin/bottle with which I feel truly comfortable. My approach has come to be something highly personalised and starting along the lines adopted by Scott, starting with a sort of olive drab base and then finding ways of overlaying glazes/washes of a brown until I reach something which feels right to me, even though it might not be to the taste of all.
The question for me is does the colour sit within what I see as almost a band of PC10 possibilty, one conditioned by a great complex of field conditions - age, weathering, repairing, matt/satin/gloss finishing, colour mixing etc. In these terms I'm not alarmed if the PC10 on the Brisfit model is close to but not an absolutely identical colour match to that on the SE5a. Equally, I have no problem with slight colour variation from one part of a model to another; indeed I strive for it as long as it is done with care
Maybe i just like the experimentation and that is a selfish justification, but whichever direction you take, you are the one to satisfy.
Best wishes
Nigel