So...Having done quite a bit of research, it appears the 1911 is virtually incapable of "firing out of battery" in the deadly explosion sort of manner. In the true technical sense, it will fire about a 10th of an inch out, though the round would be all but completely seated, and the locking lugs engaged. When it's way out (i.e. unlocked), the hammer can't hit the pin, as the bottom of the back of the slide (firing pin stop?) is sitting such that the hammer hits it before it could reach the firing pin.
I believe the jury finds the defendant, Richard Reload, guilty as charged. See what I did there...Charged...Get it...?
One thing I hadn't noticed about this 1911, and perhaps all of them, is the case support isn't exactly awe inspiring. There's about 1/10-1/16 of an inch of case exposed, which is more than double what I see on my G23 40S&W Glock (the supposed poster child for unsupported case head). My M&P shield has almost complete case support.
I think the autopsy suggests that the reload was over pressured (understatement), and failed at the web were the case was completely unsupported. Resulting in the explosive results I experienced.
On the bright side, the gun functioned as designed, and the steel frame contained most of the carnage without much incident. I am a little confused how the shrapnel escaped, as the gun was jammed closed, only 1/8 of an inch out of battery. Perhaps it was just debris or crud being blasted out of the rear of the slide. I have to admit I don't keep my guns sparkly clean, so some carbon or dust buildup could have been ejected. The chip on my glasses is smaller than a grain of salt, so perhaps that's plausible. High velocity, but low mass.
Anyway, thanks for the suggestions. I'll be scrapping all the miscellaneous rounds I found. I'll probably pull them, to rescue the exceedingly rare LP primers, so I'll keep an eye out for anymore that seem to have an excessive charge. As mentioned, I've shot thousands of rounds of 45 made by myself and my 2nd cousin, and 10X that many other pistol reloads, and this is the first Kaboom! I've ever had in anything. Chalking it up to a very low probability freak incident.
Freak or not, everyone make sure to keep those peepers protected!