You may be lucky and find that Dorchester have the record. The West Dorset Coroner is a keen historian, I know he has deposited some records at Dorchester, he also has some in his possession.
Not all the records survive, but I know Mr Johnston is keen that those that do, should be preserved. I have attended a couple of talks by him, and I remember him telling of rescuing one lot of Coroner's records from a skip, when a solicitors office was being cleared.
Jebber