Certainly glad you are OK.
I wasn't surprised to hear from Smith & Wesson that you encountered a problem related to the case and/or caseloads. I, too, have a picture of a shell rim pulled off the casing and an ejector torn out of the firearm. However, I was shooting reloads (Georgia Ammo...a place that has served me well) out of a Glock 22 with STOCK Glock barrel. One theory is that Glock's stock barrel chamber is slightly larger than specs. Run a bullet through that....it can expand, but rare, depending upon casing metal. Reload it and then the casing to chamber fit is so tight that the ejector pulls the rim off the casing while the casing stayed in the barrel. I understand fully that you were not shooting reloads and I also understand fully that you were shooting a Shield, which I expect has a barrel closer to specs than a Glock. Looks like the heavy charge, in your case, caused the damage. My pistol was not damaged. I put the ejector back in and ordered a Wolf barrel for practice. The reason I point this out to you is that your pictures look a LOT like mine. Again, I'm glad you were not hurt. I would need a concrete explanation before I would be comfortable carrying the same model for carry use and looks like you've got it. But, then again, I'm an old guy and have been spotted in restaurants with a Hiway Patrolman on my hip.