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Old December 21, 2019, 06:48 PM   #116
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Join Date: June 17, 2010
Location: Virginia
Posts: 5,529
I was going to say fail-as-bolt-was-opening/extracting, but after looking at that Ejector extrusion you're talking some extreme pressure before the case let go/before the bullet exited the barrel. Had the case not failed (when it did)/releasing pressure you would have seen much higher velocity still.

Since you & I are both seeing something that can't be explained even by loading blunder, I'd like UncleNick's opinion on reflected pressure wave thoughts.
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