The error fault is likely related to a known issue that was discovered late. Our customer service speaks for itself: we'll make it right, just stay in touch.
For those on the sidelines, shooting Nosler's on High will yield 3 shots then the ePIC panel displays "- SHOTS", meaning it will shoot but not at the velocity of the first 3. It will eventually say "CRITICAL HALT VERY LOW PRESSURE, REFILL THE TANK" when air is to low to shoot. On the Medium setting, 11 shots, the number of your string, is about right. If you were mixing it up during the string then seeing the low pressure fault at 11 shots is expected.
The magazine is NOT designed for flat-nose bullets. For the reasons mentioned, the bullets we recommend (see photo below) and sell are tapered or round so as to direct the bullet into the breech. The breech has a larger opening than the opening on the magazine precisely because bullets come out of the magazine off-center. We do offer a single-shot tray for the Rogue:http://www.crosman.com/gear/pcp/SST357
(out of stock at the moment)