That’s an excellent concern, Ted. I’m unsure. Here is a pair samples of what I’ve read in different places on the Federal 210 vs Federal 210M discrepancies: I used to be looking at the cabela's web page, 1 critique explained you could not use federals while in the Lee vehicle https://largerifleprimerswinchest94826.pages10.com/federal-215-primers-100-count-for-dummies-67372356