Hi Mr.Cag, thanks for the explanation.
I think there are 3 major questions still open, after having merged the official GAR info (McMullen) and the Vickers notes (Wilkinson/Barben):
1) Did PoW fire 55 (McMullen) or 56 (Barben) shots under director control at DS ? I would say that the total number of 105 shells expended during the whole operation is reliable (both reports concur on it). The question is the split between the three engagements.
2) Is it possible that "Y" turret No. 4 gun was fired three times consecutively at salvo 16, 17 and 18, or should we assume that the 6 shells shot by this gun are a mistake from Barben ? Here, personally, missing the input from someone really expert of British firing methodology that could confirm the "consecutive" firing as an "established" practice (under exceptional circumstances), I would tend to say that Barben made a mistake in the count......
3) As the "B" turret problem arose when it was needed to re-feed the shell ring, I would assume it happened at salvo 11 (after having fired the 2 shells loaded in the guns + the 8 shells of the ring), however it should affect before the gun No.1, while it is the No.2 missing 2 shots. Here there is another question for an expert: we have assumed up to now that the first guns fired were the odd ones (1 and 3 of each turret). Could it be that the even are fired first, at least in "B" turret ?
"It takes three years to build a ship; it takes three centuries to build a tradition" (Adm.A.B.Cunningham)