That’s an excellent concern, Ted. I’m unsure. Here is a few samples of what I’ve heard in different places within the Federal 210 vs Federal 210M variations: I have been reloading for over 35 many years and also have routinely switched concerning Winchester, CCI and Federal ( I invest in https://zionezrmh.kylieblog.com/32351441/the-best-side-of-federal-primers-for-9mm