C =cemented armour, which is another way of stating face hardened armour. Once again you launch into an improbable explanation for results that challenge the data you are presenting.
Improbable? Well you then explain the better results against RHA vs FH armour in those "test" results you posted then. One thing is for sure, if C really is for FH armour and not just C for Calculated, then it can't have been the Mk.8T which was fired. It simply must have been some other projectile.
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