Yes, gunmetal would be great. Your powdercoater should be able to show you samples in his shop of different colors as well. Bcredliner has gunmetal wheels on his 4.6 they look awesome

__________________
2018 Ram 2500 6.7L Cummins 68RFE
19k miles -Bright White/Black - Big Horn Sport - Crew Cab Short Bed
2013 X5 35D (CEO's) - Born on 5/17/2013 -
82k miles - Alpine White/Cinnamon Brown/Premium Pkg, Sport Activity/Premium Pkg and Sound/20" Style 214/Running Boards