Several thousand rounds of S&B 9x19mm, .38 Special, .45 ACP (and perhaps some others) with no problems whatsoever, maybe (but I am not sure of this) a few primer failures; however, this would be MUCH less than one percent. Perfectly good range/plinking ammunition, on a par with WInchester USA, Federal American Eagle, Speer Lawman, Remington UMC, and the like. Reasonably clean, accurate and reliable; I will continue to purchase, when it is the least expensive, quality option.