Hi-Tek coated can go well above magnum revolver velocity. There are numerous shooters using Hi-Tek bullets in rifles at 2700fps+ with no problem. As long as you take the extra care to flare, seat & crimp without damaging the coating... pressure will be your limiting factor before leading is.
I would start test batches 10% below appropriate jacketed data and ladder up in 0.2gr increments. Remember, you can expect speeds to be higher with coated compared to jacketed, so you may not need a charge as heavy as you think. Verify on the chrono and watch for pressure signs.