A second extractor cut from setting the bbl back as a result of excess headspace.
Turning it 180 degrees, recutting the chamber just enough to re-establish headspace. The new extractor cut on the '03 ends up opposite the old one which is now at 9oclock position.

The excess headspace could have been from any number of sources including setback in a soft '03 recvr,,one that had been 'reheat treated' by Sedgley.