View attachment 298663my one of over 10K uh o's from range brass, happened last week during a competition, luckily no damage other then to prisde and added time on the timer. I always load 45's soft to just under 800 fps too to allow quicker sight re-alignment, of course in a Glock 41 with that unsupported chanmer area.
Ouch! Glock's generous chamber area aid reliability but leave a bit more of the brass exposed. Glock had to add some chamber support area to the early .40 S&W models. I like this picture below to reflect that change.
What type of bullet/powder combination were you using?