What cartridge? The early 223's had magazine issues but I thought that was corrected long ago. FWIW I've not had any feeding issues with the magazines, but I've had 2 of the 4 round rotary magazines break when I dropped them loaded. It doesn't seem to hurt them if dropped unloaded. One landed on a carpeted floor, the other on my driveway. I've since gotten rid of those versions and now have a 308 that takes the AI style magazines and a 223/5.56 that takes AR magazines. I like them much better.
