Does anybody have a good source or mix for the greenie grey used on German WW II uniforms. I use enamels and testors feld grau is a real gray which is also correct especially for trousers

If you don't mind acrylic, Tamiya's Field Grey is the perfect choice. A lot of modelers, myself included, actually use it for the green on modern British AFV's.



A strong man stands up for himself.
A stronger man stands up for others. Ben

I have used Model Master Acryl Feld Grau which I think is very good.

Hasty

I think Vallejo have a "German Field Grey" in their range?
Or am i just imagining things?

There are very interesting conversations ongoing on Missing Links Axis group now about German Panzer Grey. A lot of knowledgeable modellers have voiced opinions and some agree with some things, but nobody is in total agreement about anything ... basically because its impossible to tell accuratly.
The same can be said for uniforms ... and even more so. Considering different batches of dye, materials, locations, timeframes, etc. .. there wasn´t just one shade of green-grey ... there were loads. Then these fell foul of weathering, conditions, actions, etc. ... so the array of shades is even more varied.
So don´t get too hung up on any particular shade. Have some fun with it. Mix greens and greys and even a little of other colours (flesh, sand, light browns, etc) to come up with your own mix, which looks artistically pleasing, and colours you may already have. You wont be too far off in reality.
The green on the uniforms below was made up from Humbrol 102 (army green) and humbrol 28 (camouflage grey). The dark green collars were 102 and black. The trousers were 28 and 140 (gull grey). All mixes had about 5-10% flesh in to tie them together and have a warmish/dry tone.