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Old December 24, 2012, 01:10 PM   #10
Sevens
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Join Date: July 28, 2007
Location: Central Ohio
Posts: 8,767
The bulge in a barrel is almost always cause by something that was blocking the barrel when a round was discharge behind it. Typically, it's a stuck bullet.

The bulge is really the result of a long column of air being forcibly squeezed in to a VERY small space as the moving (just fired) bullet swiftly approaches the one that is stuck. Both often exit and the ring is left behind.
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