The primer might have been pulled back in. To help get rid of that I ground off my Dillon pins at a 45 and then smoothed off the edges. It seemed to help. Kind of a known gotcha on Dillon decap pins. In the end, different dies mostly fixed it. Every once in a while it happens. If the next station the swage rod reseats/mangles it, dont toss that case back in rotation. I did that a few times. That case is now dead because the primer pocked is most likely too deep now and primers might not bottom out and light off next time. For me is was not even 50-50. It took a while to figure it my missfires.
I have heard of that happening, but never had it happen to me. I drill out the chute and install a long aluminum sleeve so I can attach a plastic tube. This dumps dead primers in a can under the bench.
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