This last week I have been working on prepping some 5.56 cases. I have broken or bent 4 depriming pins. I think I finally found the problem. I was just messing around and thought I would flatten one a piece of brass polish it up and use it as and inlay in a pistol grip. What I found was a big surprise the brass had a berdan pocket and was stamped on the case 223 Remington. I sorted through about 25 pieces and found 6 more 223 Remington. I can't remember ever hearing 223 case were Berdan pockets or where I got them. I hope this solves the problem. All the brass I have prepped so far is all once fired 5.56 lake city brass.

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Carpriver.