Thread: Case head separation imminent

Originally Posted by veitnamcam

Good reply above from Grandpamac.

Check the rest of your cases, if they are relatively clean on the outside you can usually see the line but definitely would be worth checking them all with a probe of some sort.

Actually measuring shoulder bump is the best way to control and minimize the stretching in this area but not all of it is headspace caused.
Large chamber dimensions also increase the amount of stretching in this area, for this reason I neck size only my 303 brass and only full length if nessacary and only enough to chamber freely again.

Greetings All,
Totally agree with measuring shoulder bump especially on belted cases. Setting back the shoulder by feel on a belted case can result in the shoulder being set too far back if there is a bulge in front of the belt. You will feel the bulge as a tight case and keep on setting the shoulder back too far. Measurement is essential to stop this. The bulge needs to be removed.
Regards Grandpamac.