Originally Posted by spaniel

Factory 40SW loads are consistently nearer the top end than most other cartridges. This is why it is referred to as a "hot" round. You actually void your Glock warranty by shooting reloads in it due to the unsupported chamber. If you are using full power loads and hit on an old piece of brass with a weak spot that ends up right on the unsupported area of the chamber, KABOOOM.

I run reloads but I limit the brass to 4-5 loadings and use reduced loads.