I use nothing but Winchester primers in every load and numerous guns and never had a pierced primer that I know of. However, the last sleeve of primers I used I did notice a few that appear to be missing the sealant over the flash hole. I happened to notice one when loading the primer tray and then started watching more closely. After that I found one tray with two missing the sealant. What effect does it have? I have no idea but does say something about quality control.
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