My first thought was the result of tube fed cartridges with spitzer bullets.....spitzer pushing into the primer. But I can't remember seeing a tube-fed rifle chambered for 22-250.
I would like to see the innards of that primer....how about depriming and posting another show and tell picture......maybe it is a cup only
on a for-show only-round (no primer, no powder) and somebody tried to shoot it. I made some of those for cartridge boards and pulled the anvil out rather than use a spent primer that's dimpled. (soaked them for a while first)