Find a brass bell that will fit over top of your case, a longer bodied bell will have a better shape than a short angular one. By placing the bell on top of the case and striking it with a mallet you will force the bell down over the case and this will resize the top of it,, which seems to be the problem, I use one all the time on 37mm cases, you do this until the fit is what you want, this will work on the top 1/4 of the case, You can't go much farther than this or you will curl in the top too much The longer and less severe the shape of the bell the farther you can go). But this method helps and from what I see may be all you need. Annealing as described is a good idea first. The bell has to be smooth on the inside or it will leave marks.
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