It's bouncing. I'll bet you'd see the breech almost completely open and then bounce off the bottom back up in a highspeed camera run. It *has* to open near completely if the case head is to get out as you describe.
(If you dare) have someone off to the side with a DSLR on multiframe mode and you under the table as you pull the trigger with a sting/gun sandbagged down. See if you can catch any breech or hammer setback movement.
(Or you can just put the full-up mainstring back in and see if cases still exhibit stretch.)
My thought is that it doesn't open all the way if the case doesn't separate. Once it separates, though, everything opens the rest of the way up. The breech opens/slams back and down all the way, and then bounces back up and the hammer closes it.Information
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