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What you are seeing is first generation Winchester Winclean factory loaded with lead-free primers. The large hole vents the higher pressure flash from the leadless diazol primer mix. Winchester has said they were safe for reloading with standard data. I do not sort them out of my bulk brass for IDPA, although I would if I shot NRA slowfire, just in case.
(You will likely one of these days turn up some .45 ACP brass with small primers and an NT headstamp. That is the current generation of Non Toxic ammunition with lead-free primers. Winchester says not to reload these, but it can be done if you want to go the trouble.)
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