I finally bit the bullet and picked up a Saiga 12, took her out to the range this morning and ran some slugs through her. Most of the hulls fell forward of the firing line so I only picked up a handful that were next to me to take home and cut open to see how they're constructed. I noticed that on one of the hulls, the primer backed out pretty significantly, about .05 inches. These were Winchester 3" slugs, 1 oz. @ 1760 fps. This is a bit more powerful than most of the slugs I tried, so I'm wondering if maybe I should keep these out of the Saiga from now on?