That rig would look pretty slick with the bolt and bottom metal in Graphite Black and the bbl and action in Tungsten. I do quite a few like this and they always turn out nice.
another vote for this combo.
just had a .223ackley done last week and we had them mix Tungsten & Titanium , wanted something around sniper gray in color but with a bit more metallic sheen...came out lookin like this....
Tunsten/Ti mix.... 
