Need advise on annealing case necks

[Mickey Christian]

Since I did overheat the cases would they just split if fired?
Mickey

[Parashooter]

Since I did overheat the cases would they just split if fired?

No. Case necks usually split when they are too hard, not too soft. Overheating makes them very soft - sometimes so much that they can be easily crushed at the mouth with just fingers. Such soft necks don't have enough "spring" to place sufficient tension on the seated bullet. This causes a variety of feeding and accuracy annoyances but generally isn't hazardous with bolt-action rifles in single-loading mode.

Annealing the base end, of course, can be extremely hazardous when a soft case head isn't fully supported by the breech design.