Thanks that reassuring info but I have my perfect squirrel rifle a T/C Cherokee 32 cal muzzle loader with double set and great balance. My first Cherokee burned up when T/C's big shop went up in flames years ago. It was in for new wood, a back door job from a friend and neighbor who worked there so the rifle did not exist on the books so not covered. Found another three years ago so my Fox, gray and black squirrel population knows it

Rick

Ain't that a bitch casehead seperation. My first Hornet was a beat up Winchester 43 that had a headspace problem, I learned later. As you know the brass is notoriously thin and weak and I ruined about 10-12 cases all from bad headspacing.  I was young and stupid and just figured I was loading too much WW 680, too hot. My cases all looked like yours. Then I got a T/C 83' and had T/C make a K Hornet out of it. Never had brass problems again. Love the K Hornet. 

Rick

No, please no math for me. I should have mentioned that my chamber is oversize. IF it were smaller the thin Hornet brass would stand up much better. My kiss fix is to rechamber to 25-20 Winchester because I have brass and a chamber reamer. Keep it simple stupid for me. Math just confuses me.