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Could possibly be brass fired in a fluted chamber. There are some manufacturers of fluted .223/5.56 chambers out there. Usually they size ok though and are considered safe to reload? The fluted chambers work best for steel cased ammo and can be hard on soft brass cases. That hard to resize, I'd just scrap them.
Last edited by rg1; March 10, 2019 at 12:52 AM.
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