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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.
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You can't see it in the pictures--but there's actually a small column of displaced material up the side of the head atop that expanded "plug" pressed into the ejector. Notice how the engraved lettering is intact on the ejector "plug"--as well as on the rim face.