I wasn't referring to the Peterson brass. (Apologies for not being clear)
I bought a couple hundred cases of Nosler, and on the 4th reload, the primers are loose enough that recoil will make them fall out in the mag.
My loads are under max, I'm not jambed in the lands, I don't have flat primers, hard bolt lift, or marks on the base...
I'm thinking I need to use better brass.