I know this is not the original topic of this thread but I wanted to add it. These are 3 standard pressure casings of different brands fired through my Luger. From left to right - Federal, Magtech & Blazer. They all exhibit a slight bulge. (Don't have a steel case for comparison, as I won't shoot it through a luger)
It's hard to see with the flash, but plain as day when looking at them in person.
