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The "loose chamber" on a glock has nothing to do with how "hot" the ammo can be. Chamber support does, but later Glocks are much better that the earlier models. I had a G20 that scared me a bit with the lack of chamber support; my current G23? Not so much, since it's much better.
When a cartridge is fired, the brass WILL form to the chamber wall as long as it's not an extremely light load. If the load is too light, the empty case will show black on the outside.
But normal loads will cause the casing to form to the chamber wall. That's the job of the case, in order to seal the chamber to prevent gasses from blowing backwards from the gun. Whether the chamber is loose or tight, the case is going to form to the wall of the chamber. No matter whether the cartridge is loaded "normal" or "hot", the same reaction will occur.
The loosness or tightness of the chamber has nothing to do with what level of loads the gun will handle.
Daryl
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