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Old August 10, 2012, 08:40 PM   #6
B.L.E.
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Join Date: December 20, 2008
Location: Somewhere on the Southern shore of Lake Travis, TX
Posts: 2,603
I have seen that indention ring in some .44 magnum ammo also.

When black powder was all there was, the case was usually crimped over the bullet ogive which prevented bullet pull while a compressed load of black powder prevented bullet set back. My theory is that when smokeless loads became available, the charge no longer filled the case and the ammo makers felt a need to prevent bullet setback and put in that indented groove.
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