the only time I ever saw cases look like that in a 9mm is when a shooter at the range mixed in a couple 380 acp cases. I also have a r-51 and I will admit it was mistake to waste my money on it. nothing but problems. I just got the paper work to send it back to Remington for repair.. I bet they just keep it for a while and then send it back as if you get a good Remington it works and if you get unlucky it never seems to get repaired.