It was certain lots of primers from years back.The new ones are fine now and seat much tighter too.Here are some photos of the defective ones.I filed a claim with Winchester on the older lots that gave me trouble.They paid me for the ones I sent back.

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~Molɔ̀ːn Labé Skýla~
As Bob Hagel would say"You should not use a rifle that will kill an animal when everything goes right; you should use one that will do the job when everything goes wrong."Good words of wisdom...............