[QUOTE=flightline;5244094]It's not exactly comforting, but I doubt it would have damaged anything. There's a pretty generous safety factor built in; plenty for the marginal increase in pressure from setback IMHO. Could be defective ammo or just re-chambered one to many times.[/QUOT]
Wrong. Setback can cause dangerous over pressure which can (and has) led to catastrophic failures.
That round in your picture belongs in the trash, not your handgun.
Also, if this is an SD pistol for home as well... Why are you using Full Metal Jacketed rounds? You will have serious over penetration and you are liable for EVERY round that leaves your gun.