I'd start a little below the listed max and work my way up .2gr at a time until I got the velocity I was looking for. All the data I have seen shows lead to be a little faster and pressures to be a little lower than jacketed or plated for the same powder charge. Coated seems to fall in between bare lead and jacketed.

I believe that is ample evidence that the copper of jacketed/plated bullets creates more friction in the barrel than lead, and coated is in between jacketed and lead. All other things being equal, the pressure with the same bullet and powder charge would logically correlate to the amount of friction that creates resistance to the bullet moving down the barrel.

So as long as you don't load the coated bullets with more powder than you would for a comparable weight and shape jacketed bullet you're going to be OK.

But I'd still start low and work up. That's just a good solid reloading principle.