Well, might try a base of Gunmetal (I use craft paints) and then a dry brush of a 'darker' Silver, an even lighter dry brush of 'bright' Silver.
But if this is for game table standard, perhaps overthinking it. Guessing though that you are using larger figures than I do, 15 mm for me so just the gunmetal and then a wash of silver covers it for me.
Seems to do more than I suggested above is more effort than needed even for larger figures.
Once painted and engaged on the table, paint jobs fade and action prevails in my experience.