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Personally, I think it's a 223 thing. I noticed the same problem in various 223 brass when I first started reloading for that caliber I was picking spent cases at the range. I stayed away from military brass because some of it had the berdan(s) primer, but it seemed that some of the cases had shorter necks on the cases than others and the shape of the body was weird as well. I just bought a few hundred raw winchester brass and called it a day on the used brass as I emptied them. JMO, but with 223 unless I intend on doing some longer distance shots on PDs I just buy factory loads to do short range shooting(to 200 yrd). My Ruger VT seems to like the Winchester rnds well enough that it doesn't really make it worth the time and effort for me to try and squeeze another .223 of accruacy by hand loading that particular caliber but that's just me. I guess my recommendation boils down to if you are set on reloading 223 buy some new cases full length size them the first time, trim to length you want and then just neck size the fired rounds. I never noticed much "strech" in that particular caliber just from firing.
Mil Dot
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