There is slight bulge, like when a .40 is fired through a Glock that the bulge buster will take out. Those cases don't bother me, I've reloaded many with zero issue, even warmer loads.
Some bulging is severe and looks like a tumor sticking out the side of the brass. That brass you throw away. Glock brass really doesn't present much of an issue, either that or I've gotten lucky in the thousands I've reloaded.
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