Thread: What would have this felt like?

Originally Posted by johnd

Looks like a typical case head seperation from ecxessive headspace and / or to much resizeing. Thats the one you can feel with a unfolded paper clip down the inside of the case.
If you look at the case wall you can see that its not a clean cut but goes up on a bevel as the case kept being reworked.
Just my opinion It could be totally wrong.

Dead right. Head separation from the case having the shoulder set back to far when sizing. Common with 6.6x55, 7x57 and likely others due to dies that are too short for the chamber. The heavily flattened primer is primarily due to a short case and not excess pressure.
GPM.