As was already mentioned, a new alternative to using the elusive vintage, old stock Brown Bess from Humbrol is in development by ArchiveX. They are a pillar of the Star Wars studio scale and prop community, Guy of ArchiveX has provided bang-on matched paints for all things Star Wars for ages.
Now Guy had the opportunity to produce matching paint (in enamel an acrylic varieties) from a tin of Humbrol BB, the old recipe that was used during ALIENS' production.
Lucky me was given a pre-production enamel paint sample of this awesome concoction by Guy himself:
https://archivexpaint.com/products/ex-0 ... e00b&_ss=rSince I was in the process of re-doing my hero pulse rifle, I of course more than happily used this new product to paint my shrouds.

Went on like a charm, multiple thin coats did the job. Here are some pictures, I tried to replicate the impressive hue changing properties of ArchiveX BB with different lighting:

Is it brown? Is it olive drab? Is it grey? It's all of these things all in one - I was stunned by how different this looks in pics and differing surroundings.
Here she is, displayed in a windowless hallway with ceiling lamp light:

Same display spot, slightly different camera setting and BOOM - it changes into olive drab territory:

My living room lights make her look like this:

A picture showing three props with three different paintjobs. From left to right:
- ArchiveX BB hero PR, only slight weathering from handling
- Olive drab flame unit, "as seen on screen" (=RAL 7013)
- Vintage Humbrol Brown Bess Snow Wolf PR, heavy weathering (dark overspray, massive handling, chipping etc.)

And finally, I repainted these two shroud cover plates on the magazine well of the Snow Wolf rifle to show how well ArchiveX matches directly to the vintage Humbrol after some weathering like I have on the Humbrol coat - also showing the hue changes in differing light:

The Snow Wolf counter frame, left side of the frame is vintage Humbrol BB, right side is ArchiveX BB:

You can see that they are very, very close.
Guy from ArchiveX would now very much appreciate this community's feedback.
What do you guys and gals think - is he on the right track? I will give all your feedback directly to him.