I recently took my new XS7 to the range for the first time. I brought along 2 boxes of PRVI Partizan ammo to do a preliminary sight-in. I also had some Hornady Superperformance that I'll use for hunting. The Partizan ammo was very hard to chamber, with some rounds requiring more bolt pressure than I was willing to apply. By the time I switched to the Hornady, the bore was pretty dirty, though I managed a 3" group at 200 yards. The Hornady ammo chambered perfectly. The length of the fired cases was pretty close, but there was a noticeable difference in the shapes of the shoulders. Anyone else have problems with PRVI ammo?