I'm loading for a 223ai. I'm loading pretty hot, to the point where i have to use thicker cup primers or the primers are pierced (CCI are the only ones being pierced). I loaded more with wolf 5.56 primers and alleviated any piercing. The main issue, though, is the extraction. The bolt lifts easy, maybe a tad sticky...but the rounds are stuck in the chamber to the point of having to use a blunt object on the bolt handle to extract them. This has happened even with the edges of the primer still rounded.