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Not sure if it is against the rule to post links to other forums but if you google the words 'case neck donut' and look halfway down the results on the first page there is a posting in an 'opticstalk' forum that has a good discussion on it.
There is a posting in that thread by a user called sakomato that has drawings and photos for how he deals with it.
In regards to your question about annealing, I do not see how annealing the cases would affect your ability to deal with donuts, would you run into them.
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