That could be from a longer 6 pounder though, its listed as a MK5 in the book about the Cromwell By Osprey.
WO 185 118 Tests a 6 pounder MK2 with AP.
This is a clear indication of penetration and could suggest a range/Angle combination, and therefore of some obvious use to people who understand better.
I would still suggest it would strongly indicate that richochet's would not be needed, they certainly were not for the 6 pounder atleast.
Source: " Tank versus Tank", Kenneth Macksey, Guild Publishing, 1988
has a Table showing the 6 pounder L50 penetrating the Tiger frontally at 200 metres at 30 degree's so it would suggest a ballback level for penetration.