One thing which i do stick with is: when loading for my M1A and AR I use 'armed forces' primers. Especially in the M1A. My comprehension may be the 'civilian' primers are far too delicate and boost the infamous 'slam -fires' Since I used to be three grains under max https://augustlzlwi.bloguetechno.com/the-smart-trick-of-federal-large-rifle-magnum-primers-215-that-nobody-is-discussing-67115081