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I put a .223 case in my Hornady case trimmer to hold it and use a small tooth hacksaw to cut the brass just behind the .223 shoulder. I next run the cut down and lubricated case through my Hornady 300W sizing die. Then I put the case back on the case trimmer and trim it to the correct length as listed in the reloading manuals.
Some people have reported problems with neck thickness doing this. I use Winchester .223 brass and have never had neck thickness problems in my 300W SSK Contender barrel. The cases turn out great and last for a very long time.
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