Something which i do stick to is: when loading for my M1A and AR I take advantage of 'military' primers. Especially in the M1A. My understanding could be the 'civilian' primers are far too delicate and promote the notorious 'slam -fires' For an example of why, load a Stay spherical https://traviswpcoz.weblogco.com/31946540/federal-205m-primers-in-stock-things-to-know-before-you-buy