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Originally Posted by r0sewood
The bulge is very common with both the .40 and 10mm, really isn't an issue if they chamber fine. However, Lee has a fix for it. It is called the bulge buster, actually you can rig one up yourself if you have a Lee factory crimp die.
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The BUlge Buster is for a different bulge, the one that forms just in front of the case head where it is not supported by the chamber.
This bulge is formed because the bullet is larger than the case and the bullet is effectively "resizing" the case as it's seated.
It's actually more of a ring than a bulge.
Looks like this:
http://www.xdtalk.com/forums/non-xd-...-magazine.html
The bulge you're talking about looks like this:
http://www.thegunzone.com/glock/case-bulges.html