I have already done that step, it still needs firing to smooth the necks out and even the mouths a bit.Go ahead, but totally unnecessary to fireform 358Win. Just use the right case lube and run 308 thru the 358 die and you're done.
We have new unfired 358 brass.
I've converted lots of 308's to 358 ( have 2 lol ) after sizing I just load them up and shoot them. Never had a problem or lack of any real accuracy that I could tell.I have already done that step, it still needs firing to smooth the necks out and even the mouths a bit.
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