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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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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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