I've shot thousands of rounds of Blazer Brass in both 9mm and 40S&W with no issues ever and I find it to be as clean or cleaner than anything else I've shot. Definitely not as stout as some brands but not powder puff either. I buy it by the case and currently sitting on over 6k rounds of the stuff between 9 and 40. Not sure how but maybe you got a bad batch. Maybe you could give them a call with the lot number and see what they say.