Hi, long time lurker...I may have posted once or twice here in years past.
I am seeing lines as pictured below on both Winchester brass, bought as new empty brass and loaded and fired two times, and S&B brass which is pictured, bought as new ammo, fired and then reloaded and fired again. Or in other words in both cases, twice fired. I've seen pictures on the net of brass separated at this point, and found one discarded case at the range which had separated here. Is this what I'm looking at, near failures? I see this on about 1/4 to 1/3 of my brass, to varying degrees. Fired cases compared to full length resized cases show difference in shoulder length of .002" to.003" in other words I don't think head space is excessive. Fired in Rem 700. Of course the simple answer is don't reuse any brass that has these marks, but I wonder what's the cause given that I see it on so much of my brass. Any advice is surely appreciated.
223lines.jpg
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