I will throw this out there for what it is worth (probably not much in this case). Of late Winchester has had some qa problems with their rifle and pistol primers. Not sure what the cause was, but there were lots of complaints of pierced or cracked primers. My last batch of 5000 pistol primers will show an occasional crack and leak of gas at the edge of the cup. This occurs with very modest loads. It is annoying but not a big issue. I have read that they will replace them. It might be worth a check with Winchester to see if this problem also occurred in their shotgun shell primers.
C.G.B.
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