Had this happen with a revolver one time. Luckily the cylinder locked up due to the bulled being stuck in the cone. I blame it on no powder. I was shooting light loads w/ HBWC in a 2" S&W 10. After that incident, I look closer at the brass each time. I have a habit of checking each one while in the loading block and placing a bullet over them if they appear loaded with the proper amount of powder. If anyone of them appear suspicious they are dumped back on the scale for a check.
I use an RCBS powder measure to throw my loads. It never hurts to check a few rounds now and then for proper powder weight.
If the bullet stuck so close to the chamber, I would think the pressure build up of a primer only would have pushed the slide back enough to eject the brass.
But I am not an expert either.
The only thing I ever use in my media is alcohol. Keeps the dust down.
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