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Are you saying the "thickest or widest" point is at the top, where the bullet enters the case mouth? If so a heavy taper crimp should reduce the bulge. I believe all 45 acp die sets are taper crimp... I think.. If you have a roll crimp die.. get rid of it.
If a heavy taper crimp doesn't cure the problem then it could be a buldge somewhere else.... You wouldn't be able to chamber at all with a case mouth buldge.. If you are feeding 1/8 inch into the chamber before meeting resistance than the bulge is down the case a ways.. think about it..
I've never seen 45 acp brass that was too thick to be properly sized and taper crimped. I've even done it to ww2 steel cases.
Another clue.. you said you were having a problem with the location of the shell plate during priming.. If the shell holder and sizing die aren't concentric or true during resizing you will be resizing your brass off center..
[This message has been edited by Patrick Graham (edited May 08, 2000).]
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