Sorry if this is in the wrong section, I didn't know where else to put it. I came across this piece of brass while processing some .223 I got from somewhere (don't remember where.) At first I thought it was just a .223 that had been cut down to form .300BLK brass, but then I noticed the headstamp: WCC 53...Six years before the introduction of the .223 Rem. I have a attached some pics of measurements and comparison to a .223 Rem. case. Any ideas?
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