After initially looking at that video many years ago, I thought I concluded it was a 45 caliber bullet from a bull barrel (no bushing flange visible).
[edit] But after finding my original printed copies of those frames of high speed video, I see where I compared the diameter of the flame at the muzzle in the bottom right frame to the scale affixed to the slide and (after calculating a scaling factor) initially concluded back then it was a 45 caliber gun.
I may be wrong about the caliber, but there's no mistaking the blow-by.
When you can measure what you are speaking about, and express it in numbers, you know something about it; but when you cannot measure it, when you cannot express it in numbers, your knowledge is of a meagre and unsatisfactory kind. [Lord Kelvin]
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