The feed ramp on a .40 Glock is oversized so the case is not fully supported. Because the .40 S&W is a high pressure round, brass weakened by repeated reloading will sometimes result in a catastrophic head separation. That shouldn't happen with the lower pressure .45 ACP, but I'm not familiar with the .45
GAP -- if that was the caliber.
I shoot a Springfield XDM myself.
The feed ramp on a .40 Glock is oversized so the case is not fully supported. Because the .40 S&W is a high pressure round, brass weakened by repeated reloading will sometimes result in a catastrophic head separation. I had been given a few thousand .40 once-fired cases by a police sgt. friend when I discovered this phenomenon for the first time. What a shame. Most of the cases wouldn't size correctly without a roll-press (which I don't have).
I bet an overcharged .45 round would find the unsupported base and easy place to breach.