Roger Griffiths is your man for this time period. I am sure he will be along in due course.
The column 1876 out/home - indicates his outward voyage 18 August 1876 which was F = Foreign going. 70509 = the Swansea registered sailing barque ABERFOYLE. 1877 shows the return voyage to the UK on 12 December of that year.
"If Blood was the price
We had to pay for our freedom
Then the Merchant Ship Sailors
Paid it in full”