I googled changing.223 to .300 blk case

[umrek]

I don't generally quote myself but when I do it's usually to add pictures, so here you go...

These FC cases are a NO GO, listed in a note from the conversion list mentioned above.

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Send them to me Jim....my rifle feeds everything.

 

[Caveman Jim]

Send them to me Jim....my rifle feeds everything.

I do believe that all of those made it into the recycling bin just so I wouldn't be tempted to try and use them again. Sorry.

 

[Cannonman]

I motorized a Lyman case trimmer and use their motorized deburring machine. Today will be the first day to try this load. Plan: 10.9gr IMR 4198. Excited! I've been wanting to do this for years. Also have the salt and heater coming to anneal. Fingers crossed!