A man coming from the Rasdal farm in Voss district would have sailed from the port of Bergen. The Ansgar was a sailing ship and she is still thought to have completed the fastest voyage to North America from Bergen by sail.
He is likely to be the right man. There are a number of published histories of the Voss area which may give additional information.
(Note: I also had ancestors who sailed on that voyage of the bark Ansgar from Bergen to Quebec.)