I think double charge.
The only gun ever demolished on our range was a .357 magnum with a top load of Bullseye, almost certainly doubled.
You will get Internet Diagnoses of "out of battery" and "lead in a Glock" even though with aftermarket barrel.
But I think it just way too much fast powder.
Hatcher shows a fragmented 1911 that took 12 grains of Bullseye to ruin.
I have a few facts and a lot of opinions.