I have reloaded brass ran through a Glock as well as shot reloaded ammo in my Glocks. Ive not had any problems. As with any reloading, follow the reloading guide to the letter. Also it is wise to start a little less than max load.
Whether it’s the 35, 24, 22, 23, 27, all the barrels are made the same. And you are correct; one side of the case will be slightly bulged more than the other. When the case is resized of course the bulge goes away. Any time you stress metal it is weakened and in the case of a Glock I wouldn’t want to reload the brass more than two or three times.
All of what I have said is my opinion and my experience. I am not going to tell you that you will not have a case head failure. The only case head failure I have ever witnessed was a 10mm fired in a Glock. It was a commercial reload where the case head had been annealed so the reloader could stamp his marking in it. The case head was left soft and the side blew out.
As I said this has been the only failure I have ever seen.