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Old May 15, 2010, 07:13 AM   #3
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Join Date: October 28, 2006
Location: South Central Michigan...near Ohio, Indiana.
Posts: 5,040
If you observe, almost all rifle spent cartridge cases will expand more on one side. My understanding is as follows: The cartridge must be smaller in diameter than the chamber to enable it to enter the chamber. It comes to rest on the bottom of the chamber with any clearance on the top. When it fires, it expands in the direction of the clearance to fit the chamber leaving the solid head slightly off-set from the body of the expanded case.
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