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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. :confused:
 

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Copper plated bullets are probably a little softer than copper jacketed bullets but definitely harder than lead bullets. Unfortunately, not a lot of data exists specifically for plated bullets. Vihtavuori produced some data in conjunction with Rainier, but that will only help you if you are using a Vihtavuori powder.

I don't know if this is good advice, but I generally just use data for jacketed bullets when using plated bullets.
 

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Thanks UnCruel, the problem I'm having is with the OAL length specified for the 146 gr bulet. I can't find a jacketed 146 gr bullet load with such a short OAL as specified for the wadcutter. The wadcutters I have have a cannelure on them for crimping and that will give me an OAL of about 1.32". For any jacketed bullet, the load info I have indicates an OAL of about 1.59".
 
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