Hi Tony,
I have Bridget Mullins born 1835, Kilbeheny parish, who married James Bailey in 1856 at same parish. Of their dozen children, some gave 'Mitchelstown' as the address (when arriving at ports in the US, for instance).One of Bridget's brothers was Patrick, born 1832.
The name Sherlock has a connection (but not close) to my grandma's family, whose name was Moher, again in the area near to Mitchelstown, near to Ballyporeen (Kilworth, Ballygiblin).
If you tell me a little more about the info you have on these two, I can then tell you if we can make a connection - bearing in mind though that Mullins is a very common name in that area!
Do you have any info anywhere that would give the name of a townland, or parish at least?
Cheers
Mags