i had a case head let go on my glock 24. it wrecked the extractor, spring, spring loaded bearing and that rod that lives in there with all that other stuff.
the load was pretty mundane. 4.3 grains TITEGROUP, Montana Gold 180 JHP at 1.135 oal.
the piece of brass was winchester.
i had a KKM barrel in the gun. the case failed in the extractor groove and aside from the obvious crack. no other indications of high pressure.