[Unclenick]

If you've never done annealing before, the slow but simple way is to hold the casehead between thumb and index finger, rolling the thing back while you hold the neck and shoulder in a candle flame. When the case head starts to get too warm to hold onto, wipe the soot off against a damp towel or drop it into water and wipe the soot off later. Either way, you have a case you can try resizing again.

Turning the die down further and further is just stressing your press needlessly. Once you reach the point there is no crack of light between the die and the shell holder with the press ram fully extended, the die isn't letting the case in any further. That would require grinding the die mouth back shorter. Or, there is one other thing you can do:

You can remove the decapping pin from your die and try board member F. Guffey's trick of slipping an automotive feeler gauge under the case head in the shell holder so it elevates the case by that amount. If you put in, say, a 0.005" feeler gauge, that's how much shorter the die will make the case on the next pass.