That's crazy! They are marked small rifle primers. That would be why I'm having this problem. Ok, well that is easy to fix. Thanks for the help!
Sorry, small pistol primers. Large primers would be to large in diameter to fit. LOL
It's possible that they really are rifle primers and they're just at the extreme end of the tolerance spectrum. The max allowable height dimension for a pistol primer is very close to the minimum allowable dimension for a rifle. Combine that with brass that might be on the far end of the allowable tolerances and you end up with problems like you're seeing.