I'm not following you on this one... between a new spring and an improved ejector, what would indicate that I need a *longer* ejector? Not disagreeing per se, but just not quite tracking with ya at this point.

FWIW... I measured a few other cases in calibers I happened to have close at hand... Lapua, Federa, Winchester, Remington... .308, .22-250, 6mm BR... despite variations in the case head diameter (some of the Winchester are as small as .463-.464", while some of the Lapua are .469-.470") they all had the same extractor groove diameter - .404-.4065".

If one assumes that is what is considered 'standard' for a .473 case head is a .405" groove... makes me wonder WTF does Hornady 6.5 CM brass have a .390" groove?!?