i thin k this one just got lost in the cracks of time. The cartridge wasn't a success at the time when they had just passed the .30 cal and were trying 7.62, and 5.56 was just looming too. All this and three wars in a short time, over a twenty year period and it was forgotten. I would like to try a carbine in that chamber but they are all but unobtanium here in Canadaicon and a registered trial experiment isn't much fun here, not with our overseers.