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Not a fan of Winchester primers. CCI is a much better choice if you can find them. Winchester also has a tendency to pierce easier in my experience as well due to their thinner shell.

Shooting the '03 yesterday, all I had for the reloads were Winnie primers. After picking up brass after the RFP stage the guy shooting next to me handed me a few and said, "better check your load, those primers look flat". That "load" is 48 grs of IMR 3031 under a 125 TNT, pretty anemic.
 

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Does this help with case life? I've been using a 308 small base die and got 3 firings out of some LC 240 fired brass (thank you, crew chiefs) before getting case head separation on the 4th and so thats been my line to retire em to the junk ammo can.
Your problem is that it’s MG fired brass. I’ve gotten 5 firings out of LC M118 brass without any issues, run through a SB die. Chambers on MGs are huge and the brass is beat to hell.
 
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