Factory primers backing out?
A while back I sighted in a new scope with a box of factory federal ammo. Everything went fine and I got my rifle sighted in without a problem. The other day I was looking for some brass and opened the box I had saved from sighting in. Looking at it I can see that the primers have backed out until they are just barely sticking out above the brass. I examined another box I had shot (Remington), and everything looked normal. Same with some reloads I had already made and shot.
What’s going on here? If it was excessive headspace I would expect it with every load or brand. Some of my reloads were pretty light and they looked fine too.