I wouldn´t use "pure bronze/gold" for the basecoat, but a mixture of a brass shade and black or black grey works very well for that method. I occasionally use it (read, when I think of it) instead of a pure black grey (usually VMC "German Grey) base for "silver metallics" since it gives a warmer finish than the black/grey variety.
So, my approach for this is: Basecoat in mix of VGC "Brassy Brass" and VMC "German Grey" or VMC "Black". Next layer, add some darker metal (I usually take RAC "Iron") to the mix, followed by a mixed layer of RAC "Iron" and RAC "Silver", with a final highlight of pure RAC "Silver".
Manufacturer codes: VGC= Vallejo Game Color, VMC= Vallejo Model Color, RAC= Revell Aqua Color.