Is this a problem with Win. ammo? My buddy picked up a NEF 22-250 and came with a box of Win cxp1 40 or 45 grain hp's. As he was shooting I was picking up the brass and noticed extremely flat primers. I reloaded some of the brass and on the 2nd light load it blew the case head off.

You could see on some of the cases right about where they others seperated a slight pucker or bulge,I think the brass was destroyed by very hot loading from the factory.