When I was a lot younger I annealed some 7mm mag brass, only five, due to getting some cracks in reloads after 4 or 5 times. I didn't have the brass in a pan of water to prevent the bottom from getting soft too and Yes one fired and mushed all over the head of the bolt, actually broke the extractor. I sent the gun away and was returned with a new bolt, no cost either[ being ignorant is bliss but stupid} . The bolt was nest to impossible to get out by the way, and I have it still. Always prevent the heat from softening up the case head, only need to touch the neck anyway.
Cheers
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