I've loaded lots of once fired glock bulged brass for my supported 40 chanbers. I do not load them to max loads, but keep them at mid range.
I have loaded some once glocked stuff up to 20 times now with no problems. The worst problem I have had with them is that some crack at the lip after 15 or so loadings
I load some very accurate and very hot personal defense loads. I use a max load of Longshot, which produces mid range 10MM ballistics with 180 grain bullets. However, I use factory Winchesters once fired in my weapons, and only load them 5 times hot before they go into the midrange practice loads.