Black powder fire forming

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Fastleo

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Anyone ever try this? I’m going to try soon. Thinking 30gr in 308 to 358 Winchester. Tissue paper wading to top it off. Let me know if you have tried anything similar.
 
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.
I have already done that step, it still needs firing to smooth the necks out and even the mouths a bit.
 
I have already done that step, it still needs firing to smooth the necks out and even the mouths a bit.
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.
 
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