Contact Winchester for a replacement batch!
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I dunt thunk that a resizer die is going to reduce the size of the case head???
it usually inside the shell holder!
Contact Winchester for a replacement batch!
My first thought exactly...
I would contact Winchester and have the entire lot replaced unless you are willing to check the case head thickness as well as primer pocket depth. If they are mismachining rims what else is making it thru quality control? I sometimes have seen these issues with .556/.308 brass of foreign make.
I might simply try another brand of shell holder if the cases fit my pistol.
Not sure what you are shooting them through...but I do know a recessed Smith probably won't like the thicker rims.