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I just accept that some primer flash holes will be blocked with media and inspect every case before priming. No scientific data here but I "think" that most media would be blown out of the flash hole and ignite the powder BUT it seems some blockages are so tight especially with corn cob media that it would prevent firing or cause a delayed ignition? Media blocking flash holes is a standard reply when someone asks about having a few misfires. While I think this is true, most misfires I think comes from primers not seated to the bottom of the pocket and "armed". It's a good practice to inspect all flash holes before priming.
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