Just a note regarding Badger's DCRA example, the "C inside the oval", and the "5G" are both remnants of its previous life as a 303 target rifle and have nothing to do with the 7.62 DCRA conversion.
And there are a surprisingly large number of No4Mk2 rifles which were converted to 7.62 DCRA by CAL.
I would say that I have seen every No4 action (MkI, MkI*, Mk2, MkI/2, MkI/3) & manufacturer (Savage, Long Branch, Fazackerly, Maltby & BSA) except an Enfield trials rifle converted to 7.62 for the DCRA.