Exactly what kind of bulge are you talking about?
It is common to see a bulge just ahead of the web, especially in revlovers with oversized chambers. Even after resizing the sizing die may not constrict the case back to original size that far down and you end up with a bulge. This is not a problem.
Incipient head separation usually shows as a bright ring just ahead of the cases web. This is a problem.
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