I've ran probably 200 rounds of it through my Ruger P89. First 150 or so went fine without a hiccup. Last time at the range, I had a few light primer strikes - about 6 or 7 or so out of the box of 50. Of course, could also be a dirty firing pin channel or the light main spring I changed to (though it ran fine with the lighter spring until this last box). Will need to make a follow-up range visit to collect further data.