One thing which i do stick to is: when loading for my M1A and AR I use 'military services' primers. Especially in the M1A. My understanding is the 'civilian' primers are far too gentle and encourage the infamous 'slam -fires' That is an older thread, you might not receive a https://winchesterlargerifleprime13689.digiblogbox.com/56911057/a-review-of-federal-gm150m-primers