As an update, I found some more of this batch of once-fired Speer .357 Sig brass and decapped some of it. After running 56 cases through the Lee decapper, two of them had the torn primer left behind while 54 did just fine.
Turns out there's white residue in the primer pockets of all of them...
I'm pretty sure it's some sort of corrosion "glue job" as mentioned by several. The suggestion of it getting wet makes a lot of sense. I've been using that same Lee de-capper with 100% success for too many years to put the blame on it or my technique.
One of the solutions I tried was the...
I've searched this in many forums and everyone comes to the conclusion that the primers are crimped in. I don't think so. Look at the cases on the left and you'll see the remains of the torn out primers. About 5% out of 2000 once-fired Speer .357 Sig cases tore out.
I think there is some sort...
Even though this is an old thread, I'd like to add a photo of what just happened to me after 42 years of reloading. This is from a 2000 piece batch of once-fired Speer .357 Sig brass as made by Starline (the little "s" indicates that). I would think this is very high quality brass, yet about 5%...
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