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Old December 24, 2012, 01:10 PM   #10
Senior Member
Join Date: July 28, 2007
Location: Central Ohio
Posts: 10,982
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.
Attention Brass rats and other reloaders: I really need .327 Federal Magnum brass, no lot size too small. Tell me what caliber you need and I'll see what I have to swap. PM me and we'll discuss.
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