All I can say is I have seen Glocks kaboom.
I have never seen a 1911 kaboom
1911! 100 YEARS OF PERFECTION!
The first three rounds, no problemo. Then - kaboom! Fortunately, the gun retained the slide, but the grip body was cracked, the slide distorted and the magazine was spat out the gun along with the unexpended rounds. Wasn't hurt aside from a little numbness to my hand and I had to pick a couple of pieces of brass out of my face.
The lesson here is obvious - don't ever buy gun show reloads! Never did find the guy who sold 'em, BTW. He was basically MIA from then on. I'm guessing that I wasn't the only dissatisfied customer.