My initial post with underlined....
Not knowing your experience/background in reloading, see link re. sizing die/expander die:
http://www.massreloading.com/setback.html
FWIW; we used to occasionally see guys, usually involving REM./UMC brass (.45 ACP) which had thinner case walls/less case tension, blow a case from setback.
It was most often due to bullet setback caused by expander die, type of bullet and/or chambering the round one too many times.
Expander die mandrel diameters can be all over the board. Too large a diameter mandrel will eff up case tension- which is what holds bullet in place in case.
A tapered case cartridge (.45 ACP is one) will have less case tension than a straight wall case (think revolver or .38 Super).
People frequently believe that the Taper Crimp die is what what holds bullet in place. It's not- Taper Crimp simply removes any case flair so cartridge will chamber and seat properly.
Starline handgun brass is close to being Gold Standard for brass. I doubt it was the culprit.
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