Winner Winner.On my AT, if I pierce primers , fragments will find their way into the bolt body and I will have the same problem. I would just pull your firing pin/spring assembly out of the bolt body and then dump out whatever is in your bolt and see what you have.
I wasnt even checking for blown primers yesterday but sure enough little primer bits came out of the bolt body.
6.5 Creedmoor Norma 130 match. I was using the LFP because that ammo uses large primers, but I guess I'll switch back to the SFP