I shoot an omega and 777. For years I had acrud ring after the 2nd or 3rd shot. I switched to remington clean shot primers last year and now I do not have a crud ring after 10 shots. I wondering if I am the only one that has experienced this. Every problem post I have seen about 777 is a crud ring on some guns mostly the omegas.I wouldrecommend trying the remington primers.