by straightshooter » 05 Nov 2023, 7:20 am
There is an effect, which I can't remember the name of at the moment, where very clean metals that have an affinity for alloying will tend to fuse together when in contact. More so if they are under pressure such as a projectile held in a case mouth.
Judging by your picture of the piece of neck missing from your case then that could have happened. That's not to say that there may not have been some incipient defect in the case that contributed to the failure.
"Anything is possible if you don't know what you are talking about."
"There is no expedient to which a man will not resort to avoid the real labor of thinking." Sir Joshua Reynolds