That’s an excellent question, Ted. I’m not sure. Here is a few examples of what I’ve listened to in different places around the Federal 210 vs Federal 210M variances: Then extract it by using the bolt cocking lever and inspect the round. You will almost always see s small indentation https://winchesterprimerseurope40370.myparisblog.com/32362535/federal-primers-for-9mm-things-to-know-before-you-buy