I have never bought into less friction means higher vel. Pressure pushing the bullet down the bore causes velocity. So less friction, less vel, unless you put more powder behind it. I tested this with identical moly coated bullets, you get less vel than uncoated. As long as you are not using max fmj data, you are fine with plated, even a bit beyond 1200fps.
My theory is the softer lead core expands or obturates a bit more to give a better seal in the bore. Same reason a lead bullet goes faster with the same powder charge. One day I will get a pressure trace & prove it.

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