E.Shell, thanks for posting this life lesson.Be careful to avoid "cold welding" the bullet to the case. This is where two similar metals are pressed tightly together and form a bond, even without heat. https://www.weldinghandbook.com/cold-welding/
I had this happen with brand new Starline .445 SuperMag cases and Hornady bullets. Both were perfectly clean and shiny-new. I loaded about 80 rounds and shot some soon after that worked perfectly. When I shot more from the same batch later I ran into VERY high pressures.
When I disassembled some of the remaining rounds (most I just scrapped), the case necks were so well bonded to the bullets that the 'neck portion' of the cases tore off and stayed with the bullet when I pulled them. My kinetic puller wouldn't move them, but using my press, I was able to get enough out to see what had happened.
I was able to peel some case material off the bullets with pliers, but both cases and bullets were ruined and I'm lucky I didn't blow up my gun.
I'm sorry that I don't know how to tell you to prevent it; maybe some sort of coating, maybe load and shoot your fireforming loads immediately, then reload as normal...
It could save many folks from having to learn the hard way what you learned.
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