Thread: Split shoulders

Originally Posted by Wingman

There's more than one issue here.. hard to tell if those marks in the sidewalls are the start of case head separation or marks from the chamber or dies.. the damage on the rims look like extractor gouging from sticky cases or from the shell holder from stuck cases due to lack of propper lube in the dies.
Check the inside of case where that ring is for a groove..
Hard brittle cases or over work hardend/sized will case all this especially if they are sized outside of a few thou head space tolerance

I checked for case head separation and couldn't find any. The marks in the middle line up with the container they were stored in. As for the marks on the rims, they are from a shell holder in an inertia puller.

So far I'm guessing it's a combination of the shoulder being pushed back too far and the cases becoming brittle with age.

Originally Posted by Moa Hunter

Would the trick be to fire a couple of new factory rounds and post a picture here of the cases for comparison ?

I'll see if I can find some factory cases from the rifle.