Something which i do stick to is: when loading for my M1A and AR I take advantage of 'armed service' primers. Especially in the M1A. My understanding could be the 'civilian' primers are way too gentle and endorse the infamous 'slam -fires' Sam3460: I realize these are sale charges but https://troyscerq.blogkoo.com/federal-205m-primers-in-stock-things-to-know-before-you-buy-51453854