Primer Question

[omalley72]

This is the first time this has happened to me and i'm not 100% certain as to what caused this. Loading 124grn Xtreme 9mm with CFE Pistol and Winchester SPP on a Dillon SQB. When seating the primer, I could feel something different so I decided to catch the round as it came off the press to take a look. This happened on three separate occasions. It looks as if the primer has already been fired, over pressured as well. Has anyone else experienced this or have an idea as to what could have caused this? I obviously won't be shooting these rounds, i'd just like to know how to prevent this from happening again.

[Cheep]

I can't believe those haven't been fired already...

[Sheldon]

Probably the old primer never got fully ejected off the case during decapping was just pressed back into the case again in the primer seating stage.

[jericho89]

I am not sure how the sqb holds its primers, but it does look like the old primer may not have fully popped out. Check your de-priming pin and see how close to the bottom of your stroke it popes the primers out. It may need to be lowered a little. I have had them not fully remove in a 650, but it causes rotation issues that makes it easier to figure out.

[bubbala]

Probably the old primer never got fully ejected off the case during decapping was just pressed back into the case again in the primer seating stage.

certainly the one on the left is a fired primer that has been pushed by the depriming pin.

it's pushed enough to deform the primer but not enough to pop it out.

[JTROKS]

Sometimes the anvil of spent primer holds on to the depriming pin. I've had that happened with 9mm and 40 made me watch the primer feeder. When it comes back still carrying the new primer I stop and pull the suspected case. I radiused the tip of the depriming pin and that seems to help.

[CSACANNONEER]

Fired primers where never properly removed. The "over pressure" sign that you see is really from the decapping pin pushing the primer almost out of the primer pocket. You just need to adjust your decapping pin to protrude a little further out of your die.

[omalley72]

Thanks for all the input. Based on the common feedback, I adjusted the pin and all seems to be right in the world again. Thanks again for the input!