I was on a different form and a very similar question was asked involving the CBC cases . In That thread several posters remarked on several different cartridges that CBC makes brass for seem to cause issues . My experience with these cases is mostly with 223 brass and it was significantly thicker than most commercial brass if not all . It resulted in the powder almost overflowing out of the case due to less case volume and produced 100 ft./s faster velocities compared to other cases using the same charge . This thread and that other thread leads me to believe that CBC cases are simply just thicker walled cases resulting in all kinds of problems .