Thread: 6.5x47 Lapua not chambering

For the case head to have expanded to give a tight chamber fit I think the primer pocket would not be usable.
Your load also seems right for around 60kPSI peak in a 25-26" barrel.

A thick or long neck causing a jam on chambering can usually be seen as marks on the brass once extracted unfired. Maybe blacken the neck with a pen to check so this can be eliminated from the options?
Did you fire any of the problem rounds? The jump in pressure from a significant neck jam would surely be visible on the primer.

It sounds to me that the sizing is just not quite enough somewhere between the expansion line on the case wall above the head up through to the shoulder-neck junction.
I've not personally had a die-chamber dimension mismatch that has meant that the walls were not sized in enough. On the other hand I have had to grind the bottom off dies to have them push the shoulders back far enough, so my pick would be the shoulder needs to come back more. I have also found that shoulders move more than expected on 6.5x47 Lapua brass with moderate pressures. I now use a Redding body die on every case every reload and then cycle a few (empty) to check clearances.