I have a 1omm match that I use for limited division and had the same problem with it firing brass into the next county I shortened the extractor about 1/8" and it helped a little then I installed a 40sw barrel for the cheap brass and the gun now ejects only about 6ft with the same powerfactor loads. I think it hase to do with the length of the 10mm brass picking up more energy as it is swinging out of the extractor.