Thread: Case head separation imminent

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.