I will be reloading copper plated 146gr wadcutters for 357 Mag. The Lee relaoding manual has a range of from 3.0 to 3.4 gr of Hodgdon HP-38 for the lead wadcutter. I asked the bullet manufacturer for their recommendation for the copper plated bullets and they said it should be more than for the lead bullets due to the increased friction, but wouldn't give me a number. Anyone have any experience? I was going to start with 3.4 gr of HP-38 for fear that 3.0 may be too low.