204 brass is easy to form from .222 mag. brass. I like to apply a thin coat of lube to the neck with my fingures then run the .222 mag. brass through the seating die befor you run it through the sizeing die. When setting your die you need to check you brass for correct lenth by chambering it in your rifle. You only size about 1/2 of the case neck so don`t set your seating die to deep. It`s best to set it to shallow and then screw it in untill you can close the action, but it closes alittle hard. Pick a load and start with suggested starting load and load 1 round and check for presure. If you see no presure signs work you load up alittle at a time untill you see presure signs or you get to max. load. Cases form better with higher presures. If your like me and like to form 500 rounds or so at a time work up an accurate load for fire forming and take them hunting. Your fire form loads look alittle funny with the double steep case necks, but once you fire them they`ll look like .204 cases. Now is when you want to trim them and turn the necks if nessary.
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Catfish
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