Since the angled locking lugs of the rotary delay never really lock and show signs of battering I.e. setback will you end up with excessive headspace. If so would a symptom of excessive headspace be failure of the extractor to fully seat in the rim groove? Which would show as a failure to eject, not extract. As the case is blown out because it is somewhat of a blowback design. I have trouble with and extracted case being shoved forward by the ejector but not rotating out on the extractor. Or is this all hogwash, because on bolt closing the barrel extension and bolt face slam into each other allowing the extractor time to hook the round. So excessive headspace would be function of chamber depth. So case length becomes critical. Also extractor groove size compared to rim thickness are there any recommended standards?