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DannyB1954 · December 12, 2013, 08:39 PM

To OP, the 9mm does have a tapered case by design. that is why it feeds well in machine guns. It is for that reason that they do not make pass through dies to take bulges out like they do 40S&W. Perhaps the cases were deformed a bit shooting in a gun without fully supported chambers, (like a Glock).
Also if you do not flair enough, the bullet pressing into the case can cock and deform the case.

December 12, 2013, 08:39 PM	#23
DannyB1954 Senior Member Join Date: December 10, 2013 Location: Pahrump Nv USA Posts: 480	9mmBulge To OP, the 9mm does have a tapered case by design. that is why it feeds well in machine guns. It is for that reason that they do not make pass through dies to take bulges out like they do 40S&W. Perhaps the cases were deformed a bit shooting in a gun without fully supported chambers, (like a Glock). Also if you do not flair enough, the bullet pressing into the case can cock and deform the case.