That’s an excellent issue, Ted. I’m not sure. Here is a pair examples of what I’ve heard in numerous sites about the Federal 210 vs Federal 210M discrepancies: I can't seem to uncover any CCI large pistol primers. Each individual retail outlet I visit all around listed here They are https://210federalprimersforsale16925.eedblog.com/31928660/considerations-to-know-about-federal-gold-medal-small-rifle-primers