I think it is bad primers. Trying to contact Winchester to relsoved the issue. I'm sitting on two cases of over 9000 primers with two separate lots. I have over 600 rounds of ammo loaded without noticing the issue.I experienced pinholes in the edge of WLR primers at virtually starting loads with 8208XBR and another powder, an IMR enduron powder (which one escapes me). It did not happen on every cartridge, only one out of ten or so. It was in 22-250 with Nosler varmagedon 55g bullets. I thought at first it was pressure signs. It looked like soot around a leaking primer, but closer inspection revealed the tiny holes!
Do I have bad primers?