I've bought and shot hundreds of rounds of the 380 silver bear without any problems, I bought 2000 rounds of 9mm wolf brand. While firing rounds out of the first case I opened, I had 2 rounds at separate times from the same box that were over pressured the cases got stuck in my chamber, I ended using a steel rod to beak the case free. I didn't fire anymore from that box but continued to shoot other boxes from the case. Wolf has a performance guaranty, I called up a rep, he asked me to send the remainder of my rounds from the defective box and I did. About 4 weeks later UPS hands me a box with a full case of 9mm's, a shirt and hat, with a thankyou letter. I've since shot up all the ammo without anymore problems.