I know the man this happened to and personally spoke to him today at our club. I've been away a few weeks and didn't know this happened until today. He is an experienced shooter and reloader, he is a range officer and runs some of our matches. He's a Milsurp guy just like us, Thank God he walked away with relatively minor injuries. He took what he thinks was the firing pin to the forehead which left a deep cut that didn't penetrate the skull. He took shrapnel to the cheek, left chest and arm. He will be scared but he's alive. DO NOT USE converted .30-40 brass to make 6mm Navy.

Link to Forgotten Weapons where it was written about.
Winchester Lee Navy Safety? Forgotten Weapons
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